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A218813 Hilltop maps: number of 4Xn binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..3 4Xn array 1
1, 225, 3843, 63499, 1015637, 16247233, 259935681, 4158793313, 66538666069, 1064587366577, 17032902497577, 272518501016117, 4360168964895763, 69760670600929839, 1116138204971281197, 17857690900483942101 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A218810

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=3

..1..0..1....0..1..1....1..1..0....1..1..1....0..1..1....1..0..1....1..0..0

..0..1..0....1..0..1....1..1..1....0..1..0....0..0..0....1..0..0....0..1..1

..0..1..1....1..0..1....1..1..1....1..1..0....0..1..0....0..0..1....0..1..0

..0..1..0....1..1..0....1..1..1....0..0..1....0..1..1....0..1..1....1..0..1

CROSSREFS

Sequence in context: A110204 A180697 A230065 * A330819 A297760 A167035

Adjacent sequences:  A218810 A218811 A218812 * A218814 A218815 A218816

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 06 2012

STATUS

approved

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Last modified May 21 03:13 EDT 2022. Contains 353886 sequences. (Running on oeis4.)