a(n) = 4*(n^4-n^3).

Terms

a(0) =0a(1) =32a(2) =216a(3) =768a(4) =2000a(5) =4320a(6) =8232a(7) =14336a(8) =23328a(9) =36000a(10) =53240a(11) =76032a(12) =105456a(13) =142688a(14) =189000a(15) =245760a(16) =314432a(17) =396576a(18) =493848a(19) =608000a(20) =740880a(21) =894432a(22) =1070696a(23) =1271808a(24) =1500000a(25) =1757600a(26) =2047032a(27) =2370816a(28) =2731568a(29) =3132000