Row sums of triangle A137855.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =17a(5) =39a(6) =97a(7) =261a(8) =756a(9) =2343a(10) =7722a(11) =26917a(12) =98789a(13) =380360a(14) =1531698a(15) =6434385a(16) =28130890a(17) =127729730a(18) =601196428a(19) =2928369917a(20) =14738842361a(21) =76547694741a(22) =409718539681