T(2n,n), array T given by A047010.

Terms

a(0) =1a(1) =1a(2) =3a(3) =15a(4) =91a(5) =521a(6) =3165a(7) =19723a(8) =122915a(9) =777871a(10) =4960453a(11) =31763531a(12) =204603229a(13) =1323059284a(14) =8582389291a(15) =55845106760a(16) =364271278595