Row sums of triangle A117427.

Terms

a(0) =1a(1) =3a(2) =9a(3) =30a(4) =110a(5) =442a(6) =1908a(7) =8822a(8) =43330a(9) =224595a(10) =1221860a(11) =6953514a(12) =41232563a(13) =253992215a(14) =1620599471a(15) =10689986451a(16) =72734177909a(17) =509288018981