Quotients arising from sequence A053312.

Terms

a(0) =1a(1) =3a(2) =14a(3) =132a(4) =691a(5) =1908a(6) =16579a(7) =47352a(8) =414301a(9) =1183713a(10) =5474669a(11) =27151397a(12) =135646011a(13) =678174568a(14) =6442602909a(15) =18480090517a(16) =85533990571a(17) =424236721848