a(n) = 4*n^4 + 24*n^3 + 84*n^2 + 144*n + 98.

Terms

a(0) =98a(1) =354a(2) =978a(3) =2258a(4) =4578a(5) =8418a(6) =14354a(7) =23058a(8) =35298a(9) =51938a(10) =73938a(11) =102354a(12) =138338a(13) =183138a(14) =238098a(15) =304658a(16) =384354a(17) =478818a(18) =589778a(19) =719058a(20) =868578a(21) =1040354a(22) =1236498a(23) =1459218a(24) =1710818a(25) =1993698a(26) =2310354a(27) =2663378a(28) =3055458a(29) =3489378