Central terms of pendular triangle A118350.

Terms

a(0) =1a(1) =1a(2) =6a(3) =42a(4) =325a(5) =2688a(6) =23286a(7) =208659a(8) =1918314a(9) =17994264a(10) =171542460a(11) =1657212768a(12) =16188521454a(13) =159634359415