a(n) = 4*n^4 + 17*n^2 + 4.

Terms

a(0) =4a(1) =25a(2) =136a(3) =481a(4) =1300a(5) =2929a(6) =5800a(7) =10441a(8) =17476a(9) =27625a(10) =41704a(11) =60625a(12) =85396a(13) =117121a(14) =157000a(15) =206329a(16) =266500a(17) =339001a(18) =425416a(19) =527425a(20) =646804a(21) =785425a(22) =945256a(23) =1128361a(24) =1336900a(25) =1573129a(26) =1839400a(27) =2138161a(28) =2471956a(29) =2843425