a(n) = Sum_{k=0..2n-3} T(n,k) * T(n,k+3), with T given by A027113.
A027143
a(n) = Sum_{k=0..2n-3} T(n,k) * T(n,k+3), with T given by A027113.
Terms
- a(0) =57a(1) =486a(2) =4117a(3) =34760a(4) =293086a(5) =2471917a(6) =20870169a(7) =176467252a(8) =1494672812a(9) =12682766442a(10) =107814252502a(11) =918166760699
External references
- oeis: A027143