a(n) = Sum_{k=0..2n-3} T(n,k) * T(n,k+3), with T given by A026568.
A027280
a(n) = Sum_{k=0..2n-3} T(n,k) * T(n,k+3), with T given by A026568.
Terms
- a(0) =26a(1) =164a(2) =1224a(3) =7664a(4) =51488a(5) =326456a(6) =2126376a(7) =13574046a(8) =87554326a(9) =560845908a(10) =3607790136a(11) =23158545126a(12) =148945375022a(13) =957564479960
External references
- oeis: A027280