Number of Q-graphs with 2n edges.

Terms

a(0) =0a(1) =1a(2) =2a(3) =8a(4) =48a(5) =328a(6) =2335a(7) =17133a(8) =128262a(9) =975547a(10) =7518282a(11) =58582564a(12) =460769228a(13) =3653385453a(14) =29170737927a(15) =234350263419