a(n) = Sum_{k=0..n} binomial(4*n+1,k) * binomial(4*n-k-1,n-k).

A386834

a(n) = Sum_{k=0..n} binomial(4*n+1,k) * binomial(4*n-k-1,n-k).

Terms

    a(0) =1a(1) =8a(2) =111a(3) =1738a(4) =28701a(5) =488412a(6) =8473387a(7) =148994510a(8) =2645999673a(9) =47349481408a(10) =852429930567

External references