a(n) = (n^2-1)^2-1.

Terms

a(0) =0a(1) =-1a(2) =8a(3) =63a(4) =224a(5) =575a(6) =1224a(7) =2303a(8) =3968a(9) =6399a(10) =9800a(11) =14399a(12) =20448a(13) =28223a(14) =38024a(15) =50175a(16) =65024a(17) =82943a(18) =104328a(19) =129599a(20) =159200a(21) =193599a(22) =233288a(23) =278783a(24) =330624a(25) =389375a(26) =455624a(27) =529983a(28) =613088a(29) =705599