a(n) = n^4 + 4*n^2 + 3.

Terms

a(0) =3a(1) =8a(2) =35a(3) =120a(4) =323a(5) =728a(6) =1443a(7) =2600a(8) =4355a(9) =6888a(10) =10403a(11) =15128a(12) =21315a(13) =29240a(14) =39203a(15) =51528a(16) =66563a(17) =84680a(18) =106275a(19) =131768a(20) =161603a(21) =196248a(22) =236195a(23) =281960a(24) =334083a(25) =393128a(26) =459683a(27) =534360a(28) =617795a(29) =710648