Denominator of n*(n-3)*(3*n^2 - 6*n + 2)/(3*(n-1)*(n-2)).

Terms

a(0) =1a(1) =9a(2) =18a(3) =5a(4) =45a(5) =63a(6) =28a(7) =54a(8) =135a(9) =55a(10) =198a(11) =117a(12) =91a(13) =315a(14) =360a(15) =68a(16) =459a(17) =513a(18) =190a(19) =315a(20) =693a(21) =253a(22) =828a(23) =450a(24) =325a(25) =1053a(26) =1134a(27) =203a(28) =1305a(29) =1395