Row sums of the extended Catalan triangle A189231.

Terms

a(0) =1a(1) =2a(2) =4a(3) =9a(4) =18a(5) =40a(6) =80a(7) =175a(8) =350a(9) =756a(10) =1512a(11) =3234a(12) =6468a(13) =13728a(14) =27456a(15) =57915a(16) =115830a(17) =243100a(18) =486200a(19) =1016158a(20) =2032316a(21) =4232592a(22) =8465184a(23) =17577014a(24) =35154028a(25) =72804200a(26) =145608400a(27) =300874500a(28) =601749000a(29) =1240940160