a(n) = n * (16*n^2+20*n+5)^2.

Terms

a(0) =0a(1) =1681a(2) =23762a(3) =131043a(4) =465124a(5) =1275125a(6) =2948406a(7) =6041287a(8) =11309768a(9) =19740249a(10) =32580250a(11) =51369131a(12) =77968812a(13) =114594493a(14) =163845374a(15) =228735375a(16) =312723856a(17) =419746337a(18) =554245218a(19) =721200499a(20) =926160500a(21) =1175272581a(22) =1475313862a(23) =1833721943a(24) =2258625624a(25) =2758875625a(26) =3344075306