a(n) = Sum_{k=0..n} C(n,k)^2*C(2k,k)*(2k+1), where C(n,k) denotes the binomial coefficient n!/(k!*(n-k)!).
A246459
a(n) = Sum_{k=0..n} C(n,k)^2*C(2k,k)*(2k+1), where C(n,k) denotes the binomial coefficient n!/(k!*(n-k)!).
Terms
- a(0) =1a(1) =7a(2) =55a(3) =465a(4) =4047a(5) =35673a(6) =316521a(7) =2819295a(8) =25173855a(9) =225157881a(10) =2016242265a(11) =18070920255a(12) =162071863425
External references
- oeis: A246459