a(n) = n^4 + 5*n^2 + 4.

Terms

a(0) =4a(1) =10a(2) =40a(3) =130a(4) =340a(5) =754a(6) =1480a(7) =2650a(8) =4420a(9) =6970a(10) =10504a(11) =15250a(12) =21460a(13) =29410a(14) =39400a(15) =51754a(16) =66820a(17) =84970a(18) =106600a(19) =132130a(20) =162004a(21) =196690a(22) =236680a(23) =282490a(24) =334660a(25) =393754a(26) =460360a(27) =535090a(28) =618580a(29) =711490