A203341 - OEIS

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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, 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