Number of solid standard Young tableaux with n cells.

Terms

a(0) =1a(1) =1a(2) =3a(3) =9a(4) =33a(5) =135a(6) =633a(7) =3207a(8) =17589a(9) =102627a(10) =636033a(11) =4161141a(12) =28680717a(13) =207318273a(14) =1567344549a(15) =12345147705a(16) =101013795753a(17) =856212871761