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A202133 Number of zero-sum nX4 -3..3 arrays with every element equal to at least one horizontal or vertical neighbor 0
7, 1205, 135315, 22197147, 3628653641 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A202134

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

Some solutions for n=2

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

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

CROSSREFS

Sequence in context: A259253 A203871 A144927 * A229431 A159994 A278178

Adjacent sequences:  A202130 A202131 A202132 * A202134 A202135 A202136

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 11 2011

STATUS

approved

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Last modified October 17 15:01 EDT 2019. Contains 328116 sequences. (Running on oeis4.)