Number of graphs with n nodes and n-2 edges.

Terms

a(0) =0a(1) =1a(2) =1a(3) =2a(4) =4a(5) =9a(6) =21a(7) =56a(8) =148a(9) =428a(10) =1305a(11) =4191a(12) =14140a(13) =50159a(14) =185987a(15) =720298a(16) =2905512a(17) =12180208a(18) =52951701a(19) =238253067a(20) =1107432714a(21) =5308573473a(22) =26202267612a(23) =132977762151a(24) =692996060768