a(n) = 12*n^4 + 16*n^3 + 10*n^2 + 4*n + 1.

Terms

a(0) =1a(1) =43a(2) =369a(3) =1507a(4) =4273a(5) =9771a(6) =19393a(7) =34819a(8) =58017a(9) =91243a(10) =137041a(11) =198243a(12) =277969a(13) =379627a(14) =506913a(15) =663811a(16) =854593a(17) =1083819a(18) =1356337a(19) =1677283a(20) =2052081a(21) =2486443a(22) =2986369a(23) =3558147a(24) =4208353a(25) =4943851a(26) =5771793a(27) =6699619a(28) =7735057a(29) =8886123