a(n) = binomial(n+10, 10)*4^n.

Terms

a(0) =1a(1) =44a(2) =1056a(3) =18304a(4) =256256a(5) =3075072a(6) =32800768a(7) =318636032a(8) =2867724288a(9) =24216338432a(10) =193730707456