Antidiagonal sums of A361475.

Terms

a(0) =0a(1) =1a(2) =4a(3) =12a(4) =34a(5) =99a(6) =308a(7) =1040a(8) =3820a(9) =15197a(10) =65060a(11) =297828a(12) =1449742a(13) =7468527a(14) =40555732a(15) =231335944a(16) =1381989864a(17) =8623700793a(18) =56078446596a(19) =379233142780