Antidiagonal sums of array A099597.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =19a(5) =50a(6) =162a(7) =576a(8) =2469a(9) =11218a(10) =59984a(11) =331432a(12) =2120663a(13) =13784290a(14) =102616622a(15) =766648128a(16) =6507054537a(17) =54919451490a(18) =523342287196