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

Terms

a(0) =1a(1) =10a(2) =49a(3) =142a(4) =313a(5) =586a(6) =985a(7) =1534a(8) =2257a(9) =3178a(10) =4321a(11) =5710a(12) =7369a(13) =9322a(14) =11593a(15) =14206a(16) =17185a(17) =20554a(18) =24337a(19) =28558a(20) =33241a(21) =38410a(22) =44089a(23) =50302a(24) =57073a(25) =64426a(26) =72385a(27) =80974a(28) =90217a(29) =100138