411255

Appears in sequences

• Array read by antidiagonals: T(r,n) = number of two-stack sortable r-permutations.at n=43A093346
• Odd admirable numbers: such that sigma(n) = 2n + 2d for some d | n.at n=28A109729
• a(n) = E(k)*C(n+k,k) = Euler(k)*binomial(n+k,k) for k=4.at n=35A154286
• a(n) = (6/((4*n+1)*(4*n+2)))*binomial(5*n,n).at n=8A197272
• a(n) = Round((gamma^2 + 1)/gamma^(n-2)).at n=25A245531