Row sums of triangle defined in A096539.

Terms

a(0) =2a(1) =3a(2) =10a(3) =28a(4) =198a(5) =520a(6) =3570a(7) =9348a(8) =64078a(9) =1149850a(10) =3010348a(11) =54018520a(12) =370248450a(13) =969323028a(14) =6643838878a(15) =119218851370