Central terms of the triangle in A119258.

Terms

a(0) =1a(1) =3a(2) =17a(3) =111a(4) =769a(5) =5503a(6) =40193a(7) =297727a(8) =2228225a(9) =16807935a(10) =127574017a(11) =973168639a(12) =7454392321a(13) =57298911231a(14) =441739706369