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例子
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a(2)=6:
[1, 5] [1, 4] [1, 3] [1, 4] [1, 3] [1, 3]
[2, 6] [2, 6] [2, 6] [2, 5] [2, 5] [2, 4]
[3, 7] [3, 7] [4, 7] [3, 7] [4, 7] [5, 7]
[4, 8] [5, 8] [5, 8] [6, 8] [6, 8] [6, 8].
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MAPLE公司
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a: =proc(n)选项记忆`如果`(n<3,[1,1,6][n+1],(1620*n^7
-13770*n^6+41958*n^5-48762*n^4-6642*n^3+62532*n^2-48600*n
+11664)*a(n-3)+(-3260*n^7+11360*n^6-4169*n^5-19015*n^4
+14521*n^3+6179*n^2-7380*n+1764)*a(n-2)+(-80*n+1964*n^3
-7469*n^4+3631*n^2-5236*n^5+2590*n^6+1660*n*n^7-300)*a(n-1))
/((2*n+3)*(n+3”)*(10*n^2-15*n-1)*(n+2)^3)
结束时间:
seq(a(n),n=0..25);
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