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 A218632 Hilltop maps: number of n X n binary arrays indicating the locations of corresponding elements not exceeded by any horizontal, diagonal or antidiagonal neighbor in a random 0..3 n X n array 0
 1, 15, 511, 65523, 33546641, 68702054721, 562806164441653, 18442026828339805665 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A218638 LINKS EXAMPLE Some solutions for n=3 ..1..0..1....1..1..0....0..1..1....0..1..0....1..0..0....1..0..1....0..0..1 ..0..0..0....1..1..1....1..0..1....1..0..1....0..1..1....0..0..0....1..1..1 ..0..0..0....0..1..1....1..1..1....1..0..1....1..0..1....1..0..1....0..0..1 CROSSREFS Sequence in context: A092561 A218312 A218280 * A218235 A212739 A009068 Adjacent sequences:  A218629 A218630 A218631 * A218633 A218634 A218635 KEYWORD nonn AUTHOR R. H. Hardin Nov 03 2012 STATUS approved

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Last modified January 19 15:57 EST 2021. Contains 340270 sequences. (Running on oeis4.)