A convolution triangle of numbers obtained from A036224.

Terms

a(0) =1a(1) =21a(2) =1a(3) =336a(4) =42a(5) =1a(6) =4536a(7) =1113a(8) =63a(9) =1a(10) =54432a(11) =23184a(12) =2331a(13) =84a(14) =1a(15) =598752a(16) =412272a(17) =65205a(18) =3990a(19) =105a(20) =1a(21) =6158592a(22) =6531840a(23) =1518048a(24) =139860a(25) =6090a(26) =126a(27) =1a(28) =60046272a(29) =94618368