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A203842 Number of nX4 0..3 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors 1
1, 50, 2706, 84346, 2507842, 83049596, 2828543595, 95696351404, 3237561922069, 109915983761733, 3737520454582311, 127129254610881462, 4325197729686697158, 147185372366419480113, 5009327110121467821581, 170498121168210026695996 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A203846

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A165800 A042201 A097838 * A251058 A239653 A223661

Adjacent sequences:  A203839 A203840 A203841 * A203843 A203844 A203845

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 06 2012

STATUS

approved

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Last modified November 17 05:27 EST 2019. Contains 329217 sequences. (Running on oeis4.)