Antidiagonal sums of A380747.

Terms

a(0) =1a(1) =0a(2) =2a(3) =5a(4) =15a(5) =50a(6) =180a(7) =695a(8) =2869a(9) =12616a(10) =58862a(11) =290305a(12) =1508483a(13) =8233942a(14) =47086560a(15) =281420499a(16) =1753994617a(17) =11377449948a(18) =76667702218a(19) =535802458029