a(n) = Sum_{k=0..n} (-1)^(n-k) * binomial(n,k) * binomial(8*k,k) / (7*k + 1).

A346668

a(n) = Sum_{k=0..n} (-1)^(n-k) * binomial(n,k) * binomial(8*k,k) / (7*k + 1).

Terms

    a(0) =1a(1) =0a(2) =7a(3) =70a(4) =917a(5) =12922a(6) =192591a(7) =2984156a(8) =47594289a(9) =776184997a(10) =12884436285a(11) =216981375849

External references