a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026758.
A027233
a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026758.
Terms
- a(0) =1a(1) =7a(2) =34a(3) =184a(4) =785a(5) =4107a(6) =16894a(7) =88397a(8) =358212a(9) =1892182a(10) =7609892a(11) =40695540a(12) =162938176a(13) =882569071a(14) =3523144085a(15) =19320028921a(16) =76956041950a(17) =426863069443
External references
- oeis: A027233