a(n) = binomial(n+3,4)*4^4.

Terms

a(0) =256a(1) =1280a(2) =3840a(3) =8960a(4) =17920a(5) =32256a(6) =53760a(7) =84480a(8) =126720a(9) =183040a(10) =256256a(11) =349440a(12) =465920a(13) =609280a(14) =783360a(15) =992256a(16) =1240320a(17) =1532160a(18) =1872640a(19) =2266880a(20) =2720256a(21) =3238400a(22) =3827200a(23) =4492800a(24) =5241600a(25) =6080256a(26) =7015680a(27) =8055040a(28) =9205760a(29) =10475520