Antidiagonal sums of nexus numbers (A047969).

Terms

a(0) =1a(1) =2a(2) =5a(3) =14a(4) =43a(5) =144a(6) =523a(7) =2048a(8) =8597a(9) =38486a(10) =182905a(11) =919146a(12) =4866871a(13) =27068420a(14) =157693007a(15) =959873708a(16) =6091057009a(17) =40213034874a(18) =275699950381