a(n) = binomial(n+4, 4)*6^n.

Terms

a(0) =1a(1) =30a(2) =540a(3) =7560a(4) =90720a(5) =979776a(6) =9797760a(7) =92378880a(8) =831409920a(9) =7205552640a(10) =60526642176a(11) =495217981440