Product of two triangular matrices C*S2.

Terms

a(0) =1a(1) =4a(2) =2a(3) =13a(4) =20a(5) =5a(6) =41a(7) =149a(8) =98a(9) =14a(10) =131a(11) =1022a(12) =1330a(13) =462a(14) =42a(15) =428a(16) =6866a(17) =15768a(18) =9990a(19) =2112a(20) =132a(21) =1429a(22) =46188a(23) =176229a(24) =181170a(25) =66792a(26) =9438a(27) =429a(28) =4861a(29) =313601