Number of connected trivalent graphs with 2n nodes and girth exactly 4.

A006924

Number of connected trivalent graphs with 2n nodes and girth exactly 4.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =1a(4) =2a(5) =5a(6) =20a(7) =101a(8) =743a(9) =7350a(10) =91763a(11) =1344782a(12) =22160335a(13) =401278984a(14) =7885687604a(15) =166870266608

External references