a(n) = 7*binomial(6*n + 7, n)/(6*n + 7).

A233743

a(n) = 7*binomial(6*n + 7, n)/(6*n + 7).

Terms

    a(0) =1a(1) =7a(2) =63a(3) =644a(4) =7105a(5) =82467a(6) =992446a(7) =12271512a(8) =154962990a(9) =1990038435a(10) =25909892008a(11) =341225775072

External references