Diagonal sums of the triangular matrix A190088.

Terms

a(0) =1a(1) =1a(2) =4a(3) =16a(4) =42a(5) =137a(6) =443a(7) =1365a(8) =4316a(9) =13625a(10) =42785a(11) =134758a(12) =424331a(13) =1335378a(14) =4203927a(15) =13233947a(16) =41657808a(17) =131135696a(18) =412803240a(19) =1299458257a(20) =4090567673a(21) =12876698159a(22) =40534529294a(23) =127598621869a(24) =401667591501