Third column of triangle A112500.

Terms

a(0) =1a(1) =10a(2) =60a(3) =282a(4) =1149a(5) =4272a(6) =14932a(7) =49996a(8) =162369a(9) =515886a(10) =1613316a(11) =4987542a(12) =15290461a(13) =46592452a(14) =141350412a(15) =427459320a(16) =1289718225a(17) =3884883570a(18) =11688205420a(19) =35135919730a(20) =105558754461a(21) =316995030840a(22) =951656181540