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

Terms

a(0) =0a(1) =8a(2) =38a(3) =102a(4) =212a(5) =380a(6) =618a(7) =938a(8) =1352a(9) =1872a(10) =2510a(11) =3278a(12) =4188a(13) =5252a(14) =6482a(15) =7890a(16) =9488a(17) =11288a(18) =13302a(19) =15542a(20) =18020a(21) =20748a(22) =23738a(23) =27002a(24) =30552a(25) =34400a(26) =38558a(27) =43038a(28) =47852a(29) =53012