a(n) = Sum_{k=0..n} (-1)^(n-k) * binomial(n,k) * binomial(6*k,k) / (5*k + 1).

A346666

a(n) = Sum_{k=0..n} (-1)^(n-k) * binomial(n,k) * binomial(6*k,k) / (5*k + 1).

Terms

    a(0) =1a(1) =0a(2) =5a(3) =35a(4) =335a(5) =3405a(6) =36601a(7) =408630a(8) =4693535a(9) =55105970a(10) =658390845a(11) =7979041735a(12) =97847884981

External references