Triangle read by rows, in which row n consists of n(n+m) for m = 1 .. n-1.

Terms

a(0) =6a(1) =12a(2) =15a(3) =20a(4) =24a(5) =28a(6) =30a(7) =35a(8) =40a(9) =45a(10) =42a(11) =48a(12) =54a(13) =60a(14) =66a(15) =56a(16) =63a(17) =70a(18) =77a(19) =84a(20) =91a(21) =72a(22) =80a(23) =88a(24) =96a(25) =104a(26) =112a(27) =120a(28) =90a(29) =99