a(n) = 1 + 2*n^2 + 3*n^3 + 4*n^4 +5*n^5 + 6*n^6.

Terms

a(0) =1a(1) =21a(2) =641a(3) =6013a(4) =30945a(5) =112301a(6) =324721a(7) =800661a(8) =1754753a(9) =3512485a(10) =6543201a(11) =11497421a(12) =19248481a(13) =30938493a(14) =48028625a(15) =72353701a(16) =106181121a(17) =152274101a(18) =213959233a(19) =295198365a(20) =400664801a(21) =535823821a(22) =707017521a(23) =921553973a(24) =1187800705