Row sums of triangle A180165.

Terms

a(0) =1a(1) =3a(2) =7a(3) =18a(4) =51a(5) =161a(6) =560a(7) =2123a(8) =8691a(9) =38142a(10) =178407a(11) =885041a(12) =4636948a(13) =25564727a(14) =147848651a(15) =894448186a(16) =5646589363a(17) =37115577265a(18) =253517232120