Number of (6,2)-chordal bipartite graphs on n nodes.

Terms

a(0) =1a(1) =2a(2) =3a(3) =7a(4) =13a(5) =33a(6) =79a(7) =229a(8) =671a(9) =2179a(10) =7283a(11) =25632a(12) =92427a(13) =342676a(14) =1293482a(15) =4966625a(16) =19322745a(17) =76069927