a(n) = binomial(2*n+1, n)/(2*n+1) * binomial(3*n-1, n) for n >= 0.
A365771
a(n) = binomial(2*n+1, n)/(2*n+1) * binomial(3*n-1, n) for n >= 0.
Terms
- a(0) =1a(1) =2a(2) =20a(3) =280a(4) =4620a(5) =84084a(6) =1633632a(7) =33256080a(8) =701149020a(9) =15191562100a(10) =336424047960
External references
- oeis: A365771