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A287227 Number of independent vertex sets and vertex covers in the n X n queen graph. 2
1, 2, 5, 18, 87, 462, 2635, 16870, 118969, 915442, 7535369, 66807234, 633443407, 6354135838, 67480769839, 754734433310, 8870886701401 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
Eric Weisstein's World of Mathematics, Independent Vertex Set
Eric Weisstein's World of Mathematics, Queen Graph
Eric Weisstein's World of Mathematics, Vertex Cover
CROSSREFS
Row sums of A348129.
Sequence in context: A020119 A109995 A142153 * A094294 A005500 A020025
KEYWORD
nonn,more
AUTHOR
Eric W. Weisstein, May 22 2017
EXTENSIONS
a(0)=1 prepended by Alois P. Heinz, Oct 01 2021
a(11)-a(14) from Eric W. Weisstein, Feb 03 2023
a(15) from Eric W. Weisstein, Feb 04 2023
a(16) from Eric W. Weisstein, Feb 10 2023
STATUS
approved

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Last modified June 18 13:40 EDT 2024. Contains 373481 sequences. (Running on oeis4.)