a(n) = (sum_{k=0}^{n-1}(4*k^3-1)*C(n-1,k)*C(n+k,k))/n^2, where C(m,k) denotes the binomial coefficient m!/(k!*(m-k)!).
A243101
a(n) = (sum_{k=0}^{n-1}(4*k^3-1)*C(n-1,k)*C(n+k,k))/n^2, where C(m,k) denotes the binomial coefficient m!/(k!*(m-k)!).
Terms
- a(0) =-1a(1) =2a(2) =37a(3) =324a(4) =2403a(5) =16582a(6) =109961a(7) =711176a(8) =4521607a(9) =28394442a(10) =176648877a(11) =1090974156a(12) =6698429931a(13) =40930511502a(14) =249105886737
External references
- oeis: A243101