1585584

Appears in sequences

• a(n) = (2*n)!*(2*n+1)! /((n+1)! *n!^3).at n=6A000894
• Number of walks of length n on square lattice, starting at origin, staying in first quadrant.at n=12A005566
• a(n) = binomial(n+5, 5) * binomial(n+7, 5).at n=7A107396
• Number of permutations of 1..n with the sequence of sums of 2 adjacent elements having exactly 6 maxima.at n=2A179715
• List of e-perfect numbers that are not e-unitary perfect.at n=26A322858
• Triangle read by rows. T(n, k) = (n - k + 1) * binomial(n + k + 1, 2*k)^2 / (n + k + 1).at n=48A370233
• Expansion of 1/(1 - 4*x^2 - 4*x^3)^(7/2).at n=13A377190