A036918/2.

Terms

a(0) =0a(1) =1a(2) =5a(3) =24a(4) =130a(5) =815a(6) =5871a(7) =47950a(8) =438404a(9) =4438845a(10) =49320505a(11) =596778116a(12) =7812368070a(13) =110024183659