Diagonal sums of Riordan array A110165.

Terms

a(0) =1a(1) =3a(2) =12a(3) =51a(4) =226a(5) =1026a(6) =4733a(7) =22083a(8) =103914a(9) =492228a(10) =2344035a(11) =11211210a(12) =53817063a(13) =259135299a(14) =1251074772a(15) =6053946531a(16) =29354128498a(17) =142584834924a(18) =693691007267