Column 2 of triangle A127082.

Terms

a(0) =1a(1) =3a(2) =15a(3) =85a(4) =531a(5) =3600a(6) =26266a(7) =205353a(8) =1716582a(9) =15321056a(10) =145819266a(11) =1477589301a(12) =15908557455a(13) =181553715486