每一行的和都是"兔子数列"。每一列都是"杨辉三角"中的列。
- Cn:Table[(n+k)!/((2k)!(n-k)!),{n,0,9},{k,0,n}]//TableForm
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{1},
{1, 1},
{1, 3, 1},
{1, 6, 5, 1},
{1, 10, 15, 7, 1},
{1, 15, 35, 28, 9, 1},
{1, 21, 70, 84, 45, 11, 1},
{1, 28, 126, 210, 165, 66, 13, 1},
{1, 36, 210, 462, 495, 286, 91, 15, 1},
{1, 45, 330, 924, 1287, 1001, 455, 120, 17, 1}
- An:Table[(n+k)!/((2k)!(n-k)!),{n,1,9},{k,0,n}]//TableForm
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{1, 1},
{1, 3, 1},
{1, 6, 5, 1},
{1, 10, 15, 7, 1},
{1, 15, 35, 28, 9, 1},
{1, 21, 70, 84, 45, 11, 1},
{1, 28, 126, 210, 165, 66, 13, 1},
{1, 36, 210, 462, 495, 286, 91, 15, 1},
{1, 45, 330, 924, 1287, 1001, 455, 120, 17, 1}}]
- Dn:Table[(n+k+1)!/((2k+1)!(n-k)!),{n,0,9},{k,0,n}]//TableForm
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{1},
{2, 1},
{3, 4, 1},
{4, 10, 6, 1},
{5, 20, 21, 8, 1},
{6, 35, 56, 36, 10, 1},
{7, 56, 126, 120, 55, 12, 1},
{8, 84, 252, 330, 220, 78, 14, 1},
{9, 120, 462, 792, 715, 364, 105, 16, 1},
{10,165, 792, 1716, 2002, 1365, 560, 136, 18, 1}}]
- Bn:Table[(n+k+1)!/((2k+1)!(n-k)!),{n,1,9},{k,0,n}]//TableForm
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{2, 1},
{3, 4, 1},
{4, 10, 6, 1},
{5, 20, 21, 8, 1},
{6, 35, 56, 36, 10, 1},
{7, 56, 126, 120, 55, 12, 1},
{8, 84, 252, 330, 220, 78, 14, 1},
{9, 120, 462, 792, 715, 364, 105, 16, 1},
{10,165, 792, 1716, 2002, 1365, 560, 136, 18, 1}
- Cn:Table[Sum[(n+k)!y^k/((2k)!(n-k)!x^k),{k,0,n}],{n,0,9}]//TableForm
- An:Table[Sum[(n+k)!y^k/((2k)!(n-k)!x^(k-1)),{k,0,n}],{n,1,9}]//TableForm
- Dn:Table[Sum[(n+k+1)!y^k/((2 k+1)!(n-k)!x^k),{k,0,n}],{n,0,9}]//TableForm
- Bn:Table[Sum[(n+k+1)!y^(k+1)/((2k+1)!(n-k)!x^k),{k,0,n}],{n,1,9}]//TableForm
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这手工一个一个一个一个敲出来,我可不敢! |