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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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 01 2012
STATUS
approved

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Last modified April 24 13:58 EDT 2024. Contains 371960 sequences. (Running on oeis4.)