正m边形, 走了n条路, 有S(m,n)种走法。
- Table[RecurrenceTable[{(m-1)(3+n)b[3+n]==(12m-6+(6m-4)n)b[2+n]+m(3m-12
- +(m-8)n)b[1+n]-m^2(6+4n)b[n],b[1]==0,b[2]==1,b[3]==2},b,{n,1,22}],{m,3,18}]
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S(03,n)=0, 1, 2, 8, 26, 93, 330, 1194, 4352, 15998, 59180, 220138, 822718, 3087325,
S(04,n)=0, 1, 2, 9, 30, 114, 420, 1585, 5990, 22806, 87164, 334474, 1287468, 4969476,
S(05,n)=0, 1, 2, 10, 34, 137, 522, 2054, 8040, 31722, 125356, 496956, 1973862, 7854905,
S(06,n)=0, 1, 2, 11, 38, 162, 636, 2607, 10550, 43118, 176084, 721294, 2957308, 12142276,
S(07,n)=0, 1, 2, 12, 42, 189, 762, 3250, 13568, 57390, 241916, 1023358, 4328814, 18334173,
S(08,n)=0, 1, 2, 13, 46, 218, 900, 3989, 17142, 74958, 325660, 1421298, 6196428, 27051860,
S(09,n)=0, 1, 2, 14, 50, 249, 1050, 4830, 21320, 96266, 430364, 1935664, 8686678, 39050761,
S(10,n)=0, 1, 2, 15, 54, 282, 1212, 5779, 26150, 121782, 559316, 2589526, 11946012, 55236660,
S(11,n)=0, 1, 2, 16, 58, 317, 1386, 6842, 31680, 151998, 716044, 3408594, 16142238, 76682621,
S(12,n)=0, 1, 2, 17, 62, 354, 1572, 8025, 37958, 187430, 904316, 4421338, 21465964, 104646628,
S(13,n)=0, 1, 2, 18, 66, 393, 1770, 9334, 45032, 228618, 1128140, 5659108, 28132038, 140589945,
S(14,n)=0, 1, 2, 19, 70, 434, 1980, 10775, 52950, 276126,1391764, 7156254, 36380988,186196196,
S(15,n)=0, 1, 2, 20, 74, 477, 2202, 12354, 61760, 330542,1699676, 8950246, 46480462,243391165,
S(16,n)=0, 1, 2, 21, 78, 522, 2436, 14077, 71510, 392478,2056604,11081794,58726668,314363316,
S(17,n)=0, 1, 2, 22, 82, 569, 2682, 15950, 82248, 462570,2467516,13594968,73445814,401585033,
S(18,n)=0, 1, 2, 23, 86, 618, 2940, 17979, 94022, 541478,2937620,16537318,90995548,507834580, |