a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+3), with T given by A026148.
A027332
a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+3), with T given by A026148.
Terms
- a(0) =20a(1) =176a(2) =1512a(3) =12870a(4) =109164a(5) =924748a(6) =7834168a(7) =66418402a(8) =563744942a(9) =4791449750a(10) =40783720460a(11) =347663922060
External references
- oeis: A027332