Antidiagonal sums of A321400.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =17a(6) =70a(7) =401a(8) =2969a(9) =27140a(10) =296824a(11) =3805050a(12) =56375499a(13) =955491092a(14) =18372395618a(15) =397763836270