Sums of antidiagonals of A223968.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =31a(6) =61a(7) =117a(8) =228a(9) =436a(10) =845a(11) =1615a(12) =3120a(13) =5965a(14) =11501a(15) =22001a(16) =42365a(17) =81091a(18) =156010a(19) =298777a(20) =574450a(21) =1100620a(22) =2115150a(23) =4053959a(24) =7788126a(25) =14931102a(26) =28676899a(27) =54990202a(28) =105594073a(29) =202519004