Row sums of triangle A111544.

Terms

a(0) =1a(1) =2a(2) =8a(3) =46a(4) =338a(5) =2930a(6) =28726a(7) =311342a(8) =3679778a(9) =47000002a(10) =644538614a(11) =9443216366a(12) =147222001954