显示1-1个结果(共1个)。
第页1
1, 2, 7, 45, 500, 9053, 257151, 11161244, 725343385, 69407094565, 9639771895398, 1919182252611715, 541764452276876719, 214777343584048313318, 118575323291814379721651, 90492591258634595795504697, 94844885130660856889237907260, 135738086271526574073701454370969, 263921383510041055422284977248713291
配方奶粉
a(n)=和{k=0..n}二项式(n,k)*A000798号(k) ●●●●。(结束)
例子
a(0)=1到a(2)=7拓扑结构:
{{}} {{}} {{}}
{{},{1}} {{},{1}}
{{},{2}}
{{},{1,2}}
{{},{1},{1,2}}
{{},{2},{1,2}}
{{},{1},{2},{1,2}}
数学
表[Length[Select[Subset[Subsets[Range[n]],MemberQ[#,{}]&&SubsetQ[#、Union[Union@@Tuples[#,2],Intersection@@Tuples[#,2]]&]],{n,0,4}]
(*第二个程序:*)
a[n_]:=总和[二项式[n,k]*A000798号[[k+1]],{k,0,n}];
搜索在0.003秒内完成
|