Central coefficients of A175105.

Terms

a(0) =1a(1) =2a(2) =10a(3) =64a(4) =442a(5) =3166a(6) =23164a(7) =171884a(8) =1288404a(9) =9731818a(10) =73951550a(11) =564689040a(12) =4329242164a(13) =33302459936a(14) =256913334792