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A203438 Number of nX3 0..7 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors 1
1, 64, 4124, 142108, 4401184, 168492336, 6975234574, 276131799334, 10691214945638, 418995221883412, 16587140609879948, 656112048511504958, 25898901930434692628, 1022871192914249476820, 40441529880066421243639 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A203443

LINKS

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

EXAMPLE

Some solutions for n=5

..1..3..3....4..4..0....3..3..0....6..6..5....1..4..4....4..4..4....7..7..2

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

..6..6..6....2..6..6....4..4..0....5..1..0....7..7..7....7..7..7....0..7..5

..6..6..0....1..6..6....1..1..1....5..5..0....7..4..7....4..7..7....3..7..7

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

CROSSREFS

Sequence in context: A262396 A318015 A320401 * A264345 A099369 A249393

Adjacent sequences:  A203435 A203436 A203437 * A203439 A203440 A203441

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 01 2012

STATUS

approved

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Last modified January 19 04:56 EST 2022. Contains 350464 sequences. (Running on oeis4.)