a(n) = n^4 + 3*n^2 + 1.

Terms

a(0) =1a(1) =5a(2) =29a(3) =109a(4) =305a(5) =701a(6) =1405a(7) =2549a(8) =4289a(9) =6805a(10) =10301a(11) =15005a(12) =21169a(13) =29069a(14) =39005a(15) =51301a(16) =66305a(17) =84389a(18) =105949a(19) =131405a(20) =161201a(21) =195805a(22) =235709a(23) =281429a(24) =333505a(25) =392501a(26) =459005a(27) =533629a(28) =617009a(29) =709805