Row sums of A071946.

Terms

a(0) =1a(1) =2a(2) =5a(3) =17a(4) =58a(5) =202a(6) =729a(7) =2695a(8) =10140a(9) =38719a(10) =149682a(11) =584672a(12) =2304045a(13) =9149194a(14) =36573273a(15) =147057039a(16) =594374148a(17) =2413480053a(18) =9840832968a(19) =40276235226a(20) =165403090815a(21) =681373222191