Triangle in A071945 with rows reversed.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =3a(5) =1a(6) =9a(7) =9a(8) =5a(9) =1a(10) =31a(11) =31a(12) =19a(13) =7a(14) =1a(15) =113a(16) =113a(17) =73a(18) =33a(19) =9a(20) =1a(21) =431a(22) =431a(23) =287a(24) =143a(25) =51a(26) =11a(27) =1a(28) =1697a(29) =1697