a(n) = Sum_{k=0..2n-2} T(n,k) * T(n,k+2), with T given by A027052.
A027080
a(n) = Sum_{k=0..2n-2} T(n,k) * T(n,k+2), with T given by A027052.
Terms
- a(0) =2a(1) =15a(2) =100a(3) =757a(4) =5902a(5) =46907a(6) =377520a(7) =3065809a(8) =25078650a(9) =206416795a(10) =1708129244a(11) =14202265321a(12) =118585167502a(13) =993915161547
External references
- oeis: A027080