608435100

Appears in sequences

• a(n) = (2*n+3)!/(6*n!*(n+1)!).at n=12A002802
• Square array read by ascending antidiagonals: T(n,k) = [x^(3*k)] ( (1 + x)^(n+3)/(1 - x)^(n-3) )^k for n, k >= 0.at n=40A364519
• a(n) = (7*n)!*(n/2)!/((7*n/2)!*(n)!*(3*n)!).at n=4A364520