A307450 - OEIS (original) (raw)

COMMENTS

a(0) = 1 from the complete graph K_4.

a(1) = 1 from the utility graph K_{3,3}.

a(2) = 2 from the Petersen graph (and 1 other).

a(3) = 8 from the Heawood graph, GP(7,2) (and 6 others).

a(4) = 2 from the Moebius-Kantor and 8-crossed prism graphs.

a(5) = 2 from the Pappus graph (and 1 other).

a(6) = 3 from the Desargues graph (and 2 others based on 10_3 configurations).

a(7) = 4 from the 7-crossing graphs (4 in total).

a(8) = 3 from the McGee and Nauru graphs (and 1 other).

a(9) >= 3 from GP(13,5), the Coxeter-1, and McGee+1 graphs (and unknown others). - Eric W. Weisstein, Apr 12 2019

a(10) >= 2 from the Levi-1 (=McGee+2) graph and graph from 2019 Clancy et al. preprint (and unknown others). - Eric W. Weisstein, Apr 12 2019

a(11) >= 1 from the Coxeter graph (and unknown others).

a(13) >= 1 from the Levi graph (and unknown others).