Number of Git graphs (also called Git feature branch graphs) with n vertices.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =13a(6) =36a(7) =105a(8) =321a(9) =1024a(10) =3395a(11) =11661a(12) =41378a(13) =151327a(14) =569225a(15) =2198354a(16) =8703137a(17) =35270825a(18) =146143500a(19) =618422645a(20) =2669920997a(21) =11749633216a(22) =52662799223a(23) =240219771145