a(n) = n^4 - n^3 - n^2.

Terms

a(0) =0a(1) =-1a(2) =4a(3) =45a(4) =176a(5) =475a(6) =1044a(7) =2009a(8) =3520a(9) =5751a(10) =8900a(11) =13189a(12) =18864a(13) =26195a(14) =35476a(15) =47025a(16) =61184a(17) =78319a(18) =98820a(19) =123101a(20) =151600a(21) =184779a(22) =223124a(23) =267145a(24) =317376a(25) =374375a(26) =438724a(27) =511029a(28) =591920a(29) =682051