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 A286913 Number of edge covers in the grid graph P_n X P_n. 6
 0, 7, 969, 2180738, 68534828391, 30833670159649637, 197887615273032627789510, 18126687290150589819559507400227, 23696879029605485832353513435527035363501, 442121584517675331278913696274915728729945474905362 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Jean-François Alcover, Table of n, a(n) for n = 1..12 Eric Weisstein's World of Mathematics, Edge Cover Eric Weisstein's World of Mathematics, Grid Graph MATHEMATICA A286912 = Cases[Import["https://oeis.org/A286912/b286912.txt", "Table"], {_, _}][[All, 2]]; a[n_] := A286912[[2 n^2 - 2 n + 1]]; a[1] = 1; Table[a[n], {n, 1, 12}] (* Jean-François Alcover, Sep 23 2019 *) CROSSREFS Main diagonal of A286912. Cf. A286911. Sequence in context: A151579 A024098 A172918 * A201070 A332197 A213960 Adjacent sequences: A286910 A286911 A286912 * A286914 A286915 A286916 KEYWORD nonn AUTHOR Andrew Howroyd, May 15 2017 EXTENSIONS a(1) corrected by Andrew Howroyd, Jan 29 2023 STATUS approved

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Last modified June 16 19:52 EDT 2024. Contains 373432 sequences. (Running on oeis4.)