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 A218226 Hilltop maps: number of n X n binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, vertical or antidiagonal neighbor in a random 0..2 n X n array 0
 1, 15, 497, 63309, 32362849, 66220959971, 542011629493301, 17745059393526510913, 2323828045898042282454885 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A218233 LINKS EXAMPLE Some solutions for n=3 ..1..1..1....1..0..1....0..1..1....1..0..1....0..1..0....1..1..1....1..0..1 ..0..0..1....0..0..1....1..0..0....0..0..0....0..0..0....1..1..1....0..0..1 ..1..0..1....1..0..1....0..1..0....1..0..1....0..0..1....0..0..1....0..0..1 CROSSREFS Sequence in context: A285765 A287070 A062752 * A208099 A219057 A203525 Adjacent sequences:  A218223 A218224 A218225 * A218227 A218228 A218229 KEYWORD nonn AUTHOR R. H. Hardin Oct 24 2012 STATUS approved

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Last modified June 28 18:26 EDT 2022. Contains 354907 sequences. (Running on oeis4.)