a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026637.
A026968
a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026637.
Terms
- a(0) =1a(1) =8a(2) =41a(3) =208a(4) =856a(5) =3552a(6) =14172a(7) =56462a(8) =223292a(9) =881656a(10) =3475141a(11) =13688112a(12) =53891760a(13) =212145608a(14) =835111160a(15) =3287779006a(16) =12946154944a(17) =50989472460a(18) =200879577216a(19) =791617503410
External references
- oeis: A026968