61893
domain: N
Appears in sequences
- [ exp(3/7)*n! ].at n=7A030965
- Triangle read by rows: T(n,k) is the number of ordered trees with n edges and having k branches of even length (n>=0, 0<=k<=floor(n/2)).at n=43A102004
- Number of n X 4 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 1 0 1 vertically.at n=18A207165
- Number of trees on n vertices with an odd number of leaves.at n=18A262431
- Number of involutions of [n] having exactly one peak.at n=27A303649
- a(n) = Sum_{k=1..n} gcd(k, n)^3.at n=37A343497