a(n) = Sum_{k=0..2n-2} T(n,k) * T(n,k+2), with T given by A026536.
A027269
a(n) = Sum_{k=0..2n-2} T(n,k) * T(n,k+2), with T given by A026536.
Terms
- a(0) =1a(1) =5a(2) =19a(3) =150a(4) =561a(5) =4797a(6) =18089a(7) =156900a(8) =596674a(9) =5205950a(10) =19932353a(11) =174609162a(12) =672106267a(13) =5906040623a(14) =22829936683a(15) =201114700568a(16) =780077588440
External references
- oeis: A027269