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

Terms

a(0) =6a(1) =60a(2) =210a(3) =504a(4) =990a(5) =1716a(6) =2730a(7) =4080a(8) =5814a(9) =7980a(10) =10626a(11) =13800a(12) =17550a(13) =21924a(14) =26970a(15) =32736a(16) =39270a(17) =46620a(18) =54834a(19) =63960a(20) =74046a(21) =85140a(22) =97290a(23) =110544a(24) =124950a(25) =140556a(26) =157410a(27) =175560a(28) =195054a(29) =215940