a(n) = 3*n*(3*n + 1)*(3*n + 2).

Terms

a(0) =60a(1) =336a(2) =990a(3) =2184a(4) =4080a(5) =6840a(6) =10626a(7) =15600a(8) =21924a(9) =29760a(10) =39270a(11) =50616a(12) =63960a(13) =79464a(14) =97290a(15) =117600a(16) =140556a(17) =166320a(18) =195054a(19) =226920a(20) =262080a(21) =300696a(22) =342930a(23) =388944a(24) =438900a(25) =492960a(26) =551286a(27) =614040a(28) =681384a(29) =753480