129072

Appears in sequences

• Triangle of second-order Eulerian numbers of type B.at n=26A214406
• Triangle read by rows. The rows give the coefficients of the numerator polynomials for the o.g.f.s of the diagonal sequences of triangle A028338.at n=22A288875
• a(n) = (2*n+1)!! * (Sum_{k=1..n} 1/(2*k+1)).at n=6A334670
• Square array T(n,k), n>=0, k>=0, read by antidiagonals: T(n,k) = ((2n+1)!!)^k * Sum_{j=1..n} 1/(2*j+1)^k.at n=34A335095