a(n) = Sum_{k=0..n} binomial(3*n+1,5*k).

Terms

a(0) =1a(1) =1a(2) =22a(3) =254a(4) =1574a(5) =12393a(6) =107883a(7) =843756a(8) =6643782a(9) =53774932a(10) =430470899a(11) =3431847189a(12) =27481113638a(13) =219993856006