Row sums of triangle A131923.

Terms

a(0) =1a(1) =4a(2) =10a(3) =20a(4) =36a(5) =62a(6) =106a(7) =184a(8) =328a(9) =602a(10) =1134a(11) =2180a(12) =4252a(13) =8374a(14) =16594a(15) =33008a(16) =65808a(17) =131378a(18) =262486a(19) =524668a(20) =1048996a(21) =2097614a(22) =4194810a(23) =8389160a(24) =16777816a(25) =33555082a(26) =67109566a(27) =134218484a(28) =268436268a(29) =536871782