Sums of rows of the triangle in A140740.

Terms

a(0) =1a(1) =3a(2) =7a(3) =14a(4) =28a(5) =51a(6) =100a(7) =182a(8) =351a(9) =661a(10) =1287a(11) =2426a(12) =4826a(13) =9275a(14) =18314a(15) =35768a(16) =71173a(17) =139347a(18) =278251a(19) =548228a(20) =1094162a(21) =2167513a(22) =4328818a(23) =8587276a(24) =17173303a(25) =34149019a(26) =68256259a(27) =135967174a(28) =271862798a(29) =541976151