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A202131 Number of zero-sum nX2 -3..3 arrays with every element equal to at least one horizontal or vertical neighbor 1
1, 13, 123, 1205, 12287, 135179, 1493247, 16814401, 192346557, 2225951035, 26017190841, 306761764259, 3644115496927, 43571997337907, 523947428428811, 6331638407455241, 76845558853198515, 936178097032511349 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A202134

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..73

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Sequence in context: A295778 A115204 A016277 * A152583 A304353 A305916

Adjacent sequences: A202128 A202129 A202130 * A202132 A202133 A202134

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 11 2011

STATUS

approved

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Last modified December 2 07:55 EST 2022. Contains 358493 sequences. (Running on oeis4.)