Triangle obtained by adding a leading diagonal 1,0,0,0,... to A033282.

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =1a(5) =2a(6) =0a(7) =1a(8) =5a(9) =5a(10) =0a(11) =1a(12) =9a(13) =21a(14) =14a(15) =0a(16) =1a(17) =14a(18) =56a(19) =84a(20) =42a(21) =0a(22) =1a(23) =20a(24) =120a(25) =300a(26) =330a(27) =132a(28) =0a(29) =1