a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026692.
A026994
a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026692.
Terms
- a(0) =1a(1) =8a(2) =55a(3) =348a(4) =2089a(5) =10930a(6) =59507a(7) =303260a(8) =1541766a(9) =7603878a(10) =39661955a(11) =193854488a(12) =942975507a(13) =4575005798a(14) =23493563115a(15) =113291185280a(16) =541966221369
External references
- oeis: A026994