Column 4 of triangle in A133721.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =13a(9) =7a(10) =3a(11) =1a(12) =81a(13) =25a(14) =6a(15) =1a(16) =325a(17) =65a(18) =10a(19) =1a(20) =995a(21) =140a(22) =15a(23) =1a(24) =2541a(25) =266a(26) =21a(27) =1a(28) =5698a(29) =462