610248038400
domain: N
Appears in sequences
- Expansion of e.g.f. x/((1-x)(1-x^2)).at n=14A052591
- Expansion of e.g.f. x^2/((1-x)^2*(1+x)).at n=14A052657
- a(n) = 7 * n!.at n=13A062098
- a(1) = 1; a(n) = n * Sum_{k=1..n-1} a(k).at n=13A074143
- Expansion of e.g.f.: -1/(1+x-x^3).at n=14A109582
- Number of permutations of [n] for which the first two entries have the same parity (n>=2).at n=13A152661
- G.f.: C(x,y)^2 - S(x,y)^2 = Sum_{n>=0} x^(2*n)*y/[Sum_{k=0..2*n+1} T(n,k)*y^k], where C(x,y) = Sum_{n>=0} x^(2*n) / Product_{k=1..2*n} (k + y) and S(x,y) = Sum_{n>=0} x^(2*n+1) / Product_{k=1..2*n+1} (k + y).at n=56A268647