Row sums of triangle A049404.

Terms

a(0) =1a(1) =1a(2) =3a(3) =9a(4) =33a(5) =141a(6) =651a(7) =3333a(8) =18369a(9) =108153a(10) =678771a(11) =4495041a(12) =31324833a(13) =228803589a(14) =1744475643a(15) =13852095741a(16) =114235118721a(17) =976176336753