a(n) = (sum_{k=0}^{n-1}(3k^2+3k+1)*C(n-1,k)^2*C(n+k,k)^2)/n^3, where C(n,k) denotes the binomial coefficient n!/(k!*(n-k)!).
A246512
a(n) = (sum_{k=0}^{n-1}(3k^2+3k+1)*C(n-1,k)^2*C(n+k,k)^2)/n^3, where C(n,k) denotes the binomial coefficient n!/(k!*(n-k)!).
Terms
- a(0) =1a(1) =8a(2) =87a(3) =1334a(4) =25045a(5) =529080a(6) =12076435a(7) =291307490a(8) =7325385345a(9) =190294925864
External references
- oeis: A246512