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A203439 Number of nX4 0..7 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors 1
1, 372, 142108, 24278164, 3216740482, 482229769194, 79772073060022, 13081859298444294, 2103850173825539982, 338559840680298187294, 54816869874330915574505, 8891041335795074855285935 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A203443

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..98

EXAMPLE

Some solutions for n=5

..6..6..0..0....1..6..6..0....1..7..7..7....6..6..0..0....3..6..7..7

..6..6..2..2....2..6..6..6....7..7..1..7....6..6..2..1....7..7..7..7

..7..7..3..2....2..1..0..6....7..0..5..7....3..3..6..6....7..1..2..2

..7..7..4..2....5..5..6..6....7..3..5..7....4..4..6..6....7..0..7..7

..7..7..4..0....5..5..6..6....7..7..7..7....4..4..2..2....7..7..7..7

CROSSREFS

Sequence in context: A265659 A238774 A299832 * A265235 A202912 A297383

Adjacent sequences:  A203436 A203437 A203438 * A203440 A203441 A203442

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 01 2012

STATUS

approved

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Last modified January 28 21:53 EST 2022. Contains 350669 sequences. (Running on oeis4.)