Triangle in A144385 read downwards by columns.

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =1a(5) =1a(6) =0a(7) =1a(8) =3a(9) =1a(10) =0a(11) =0a(12) =7a(13) =6a(14) =1a(15) =0a(16) =0a(17) =10a(18) =25a(19) =10a(20) =1a(21) =0a(22) =0a(23) =10a(24) =75a(25) =65a(26) =15a(27) =1a(28) =0a(29) =0