a(n) = Sum_{k=0..n} (2k+1)*C(n,k)^2*C(n+k,k)^2, where C(n,k) denotes the binomial coefficient n!/(k!*(n-k)!).
A246462
a(n) = Sum_{k=0..n} (2k+1)*C(n,k)^2*C(n+k,k)^2, where C(n,k) denotes the binomial coefficient n!/(k!*(n-k)!).
Terms
- a(0) =1a(1) =13a(2) =289a(3) =7733a(4) =223001a(5) =6689045a(6) =205569505a(7) =6422252485a(8) =203029535305
External references
- oeis: A246462