a(n) = 10*binomial(7*n+10,n)/(7*n+10).

A233908

a(n) = 10*binomial(7*n+10,n)/(7*n+10).

Terms

    a(0) =1a(1) =10a(2) =115a(3) =1450a(4) =19425a(5) =271502a(6) =3915100a(7) =57821940a(8) =870238200a(9) =13298907050a(10) =205811513765

External references