Convolution triangle, read by rows, where diagonals are successive self-convolutions of A118346.

Terms

a(0) =1a(1) =1a(2) =0a(3) =1a(4) =1a(5) =0a(6) =1a(7) =2a(8) =5a(9) =0a(10) =1a(11) =3a(12) =11a(13) =30a(14) =0a(15) =1a(16) =4a(17) =18a(18) =70a(19) =201a(20) =0a(21) =1a(22) =5a(23) =26a(24) =121a(25) =487a(26) =1445a(27) =0a(28) =1a(29) =6