3,7

Gordon Royle, Cubic Cages

Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.

a(12) = 1 from the unique generalized hexagon of order 2.

Cf. A000066 (size of these graphs).

Adjacent sequences: A052450 A052451 A052452 this_sequence A052454 A052455 A052456

Sequence in context: A040321 A040322 A040323 this_sequence A040315 A040316 A135216

nonn,more,hard

Eric Weisstein (eric(AT)weisstein.com)

a(11) from B. D. McKay and W. Myrvold.