Triangle T(n,k) read by rows: multiply row n of Pascal's triangle (A007318) by A001147(n).

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =6a(5) =3a(6) =15a(7) =45a(8) =45a(9) =15a(10) =105a(11) =420a(12) =630a(13) =420a(14) =105a(15) =945a(16) =4725a(17) =9450a(18) =9450a(19) =4725a(20) =945a(21) =10395a(22) =62370a(23) =155925a(24) =207900a(25) =155925a(26) =62370a(27) =10395a(28) =135135a(29) =945945