OFFSET
7,1
COMMENTS
There are presumably earlier terms in the sequence, but the reference does not give them.
REFERENCES
Larrion, F.; Pizana, M. A.; and Villarroel-Flores, R.; The clique operator on matching and chessboard graphs. Discrete Math. 309 (2009), no. 1, 85-93.
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Dec 01 2011
STATUS
approved