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A203342 Number of nX4 0..4 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors 1
1, 95, 9555, 503409, 23912553, 1288066857, 72606563663, 4048732987777, 224803736954347, 12536125586656167, 701080855015785026, 39228019277755257087, 2195365093327710655400, 122904723679862273403598 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A203346

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Sequence in context: A060484 A017811 A017758 * A255936 A203187 A103281

Adjacent sequences:  A203339 A203340 A203341 * A203343 A203344 A203345

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 31 2011

STATUS

approved

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Last modified April 14 12:11 EDT 2021. Contains 342949 sequences. (Running on oeis4.)