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A203341 Number of nX3 0..4 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors 1
1, 25, 635, 9555, 142167, 2566719, 48091042, 870803077, 15677729113, 285592250536, 5229626169635, 95709720070629, 1751500859436863, 32083750075804047, 588112814640699586, 10783024853712580946 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A203346

LINKS

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

EXAMPLE

Some solutions for n=5

..2..4..4....1..4..4....3..3..2....2..3..3....4..4..3....1..2..2....4..4..2

..3..4..4....2..4..4....3..3..2....2..4..4....4..4..3....3..4..4....4..4..4

..3..3..2....2..0..0....4..4..3....1..4..4....4..0..3....3..4..4....0..3..4

..2..2..0....2..2..0....4..4..4....0..4..4....4..4..4....1..3..3....0..4..4

..0..0..0....2..2..0....1..4..4....0..2..2....4..4..4....0..3..3....0..4..4

CROSSREFS

Sequence in context: A171299 A009969 A042202 * A260048 A152256 A153111

Adjacent sequences:  A203338 A203339 A203340 * A203342 A203343 A203344

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 31 2011

STATUS

approved

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Last modified March 2 12:26 EST 2021. Contains 341750 sequences. (Running on oeis4.)