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A201798 Number of zero-sum nX3 -2..2 arrays with every element unequal to at most two horizontal and vertical neighbors 1
19, 455, 4057, 48335, 562961, 7099021, 90062519, 1168520339, 15269686011, 201396758073, 2670595602167, 35597100656221, 476317522683397, 6395415423401799, 86112911010980123, 1162374111689802707 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A201803

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..40

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A194730 A012506 A285398 * A284197 A081686 A284163

Adjacent sequences:  A201795 A201796 A201797 * A201799 A201800 A201801

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 05 2011

STATUS

approved

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Last modified May 9 06:30 EDT 2021. Contains 343692 sequences. (Running on oeis4.)