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 A218235 Hilltop maps: number of n X n binary arrays indicating the locations of corresponding elements not exceeded by any king-move neighbor in a random 0..3 n X n array 0
 1, 15, 511, 65535, 33552513, 68715299265, 562915602593793 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A218242 LINKS Table of n, a(n) for n=1..7. EXAMPLE Some solutions for n=3 ..1..1..0....0..1..0....1..0..1....1..0..1....0..1..0....1..1..0....0..1..0 ..0..1..0....0..1..0....0..0..1....0..0..1....1..0..1....0..1..1....0..0..0 ..0..1..1....1..1..0....1..1..1....1..1..0....1..0..1....0..1..1....1..0..1 CROSSREFS Sequence in context: A218312 A218280 A218632 * A212739 A009068 A268960 Adjacent sequences: A218232 A218233 A218234 * A218236 A218237 A218238 KEYWORD nonn AUTHOR R. H. Hardin Oct 24 2012 STATUS approved

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Last modified June 12 10:35 EDT 2024. Contains 373331 sequences. (Running on oeis4.)