Row sums of A306015.

Terms

a(0) =0a(1) =2a(2) =4a(3) =14a(4) =56a(5) =282a(6) =1692a(7) =11846a(8) =94768a(9) =852914a(10) =8529140a(11) =93820542a(12) =1125846504a(13) =14636004554a(14) =204904063756