Row sums of A344557.

Terms

a(0) =1a(1) =2a(2) =8a(3) =28a(4) =116a(5) =468a(6) =2004a(7) =8580a(8) =37700a(9) =166612a(10) =746420a(11) =3364964a(12) =15297508a(13) =69924788a(14) =321492948a(15) =1484809668a(16) =6887663748a(17) =32068609428a(18) =149827726068a(19) =702154578468