a(0) = 0, thereafter, a(n) = 2^(2*n-1)*( binomial((3*n-1)/2,n) - binomial(3*n/2, n)/3 ).
A244469
a(0) = 0, thereafter, a(n) = 2^(2*n-1)*( binomial((3*n-1)/2,n) - binomial(3*n/2, n)/3 ).
Terms
- a(0) =0a(1) =1a(2) =7a(3) =58a(4) =515a(5) =4746a(6) =44758a(7) =428772a(8) =4154403a(9) =40599130a(10) =399429602a(11) =3950996556a(12) =39255152846a(13) =391466112324
External references
- oeis: A244469