a(n) = (n*(n+1))^3.

Terms

a(0) =0a(1) =8a(2) =216a(3) =1728a(4) =8000a(5) =27000a(6) =74088a(7) =175616a(8) =373248a(9) =729000a(10) =1331000a(11) =2299968a(12) =3796416a(13) =6028568a(14) =9261000a(15) =13824000a(16) =20123648a(17) =28652616a(18) =40001688a(19) =54872000a(20) =74088000a(21) =98611128a(22) =129554216a(23) =168196608a(24) =216000000a(25) =274625000a(26) =345948408a(27) =432081216a(28) =535387328a(29) =658503000