a(n) = n^4 + 14*n^3 + 63*n^2 + 98*n + 28.

Terms

a(0) =28a(1) =204a(2) =604a(3) =1348a(4) =2580a(5) =4468a(6) =7204a(7) =11004a(8) =16108a(9) =22780a(10) =31308a(11) =42004a(12) =55204a(13) =71268a(14) =90580a(15) =113548a(16) =140604a(17) =172204a(18) =208828a(19) =250980a(20) =299188a(21) =354004a(22) =416004a(23) =485788a(24) =563980a(25) =651228a(26) =748204a(27) =855604a(28) =974148a(29) =1104580