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A286871 Number of irredundant sets in the n X n king graph. 3
2, 5, 43, 647, 22049, 1455385, 218691097, 72877697369, 51489351108548, 76986419992442614, 244445556617038272066, 1683765308911934025295376 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
Eric Weisstein's World of Mathematics, Irredundant Set
Eric Weisstein's World of Mathematics, King Graph
MATHEMATICA
A286870 = Import["https://oeis.org/A286870/b286870.txt", "Table"][[All, 2]];
a[n_] := A286870[[2 n^2 - 2 n + 1]];
Table[a[n], {n, 1, 9}] (* Jean-François Alcover, Sep 23 2019 *)
CROSSREFS
Main diagonal of A286870.
Sequence in context: A273398 A116297 A215170 * A027730 A225724 A333734
KEYWORD
nonn,more
AUTHOR
Andrew Howroyd, Aug 02 2017
EXTENSIONS
a(10)-a(12) from Christian Sievers, Nov 22 2023
STATUS
approved

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Last modified February 26 10:13 EST 2024. Contains 370343 sequences. (Running on oeis4.)