Row sums of triangle A046658.

Terms

a(0) =1a(1) =4a(2) =18a(3) =85a(4) =411a(5) =2013a(6) =9933a(7) =49236a(8) =244750a(9) =1218888a(10) =6077644a(11) =30329434a(12) =151439158a(13) =756452890a(14) =3779590010a(15) =18888255205a(16) =94405918355a(17) =471899946985