Column 2 of triangle A115085.

Terms

a(0) =1a(1) =3a(2) =7a(3) =32a(4) =158a(5) =933a(6) =5939a(7) =41385a(8) =306070a(9) =2403792a(10) =19799468a(11) =170676213a(12) =1530176012a(13) =14235081941a(14) =136908376331