A243334 Number of simple connected graphs with n nodes that are distance regular and triangle-free.

1, 1, 0, 1, 1, 2, 1, 3, 1, 4, 1, 3, 1, 5, 1, 5, 1, 4

Offset

1,6

Links

Table of n, a(n) for n=1..18.

Travis Hoppe and Anna Petrone, Encyclopedia of Finite Graphs

Travis Hoppe and Anna Petrone, Integer sequence discovery from small graphs, arXiv preprint arXiv:1408.3644 [math.CO], 2014.

Crossrefs

Cf. A241814 (distance regular graphs), A024607 (triangle-free graphs).

Sequence in context: A218533 A328578 A351613 * A094741 A360653 A380278

Adjacent sequences: A243331 A243332 A243333 * A243335 A243336 A243337

Keyword

nonn,more

Author

Travis Hoppe and Anna Petrone, Jun 03 2014

Extensions

a(11)-a(18) from Max Alekseyev, Dec 29 2024

Status

approved