181621440

Appears in sequences

• Fourth (unsigned) column of triangle A062138 (generalized a=5 Laguerre).at n=6A062150
• a(n) = (2*n+1)!*(2*n-2)!/(2*((n-1)!)*(n!)^2), n=1,2,... .at n=5A113677
• Table read by rows, T(n, k) = Y(2*n, k, Z(2*n - k)) where Y are the partial Bell polynomials and Z(m) is the list [A126869(j), j = 1..2*(m+1)].at n=34A350462