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A201842 Number of zero-sum nX3 -1..1 arrays with every element equal to at least one horizontal or vertical neighbor 1
1, 25, 125, 2019, 17031, 259811, 2809217, 38543397, 461143387, 6074619247, 75861583015, 986136042011, 12563765990869, 162856252154639, 2096257481229633, 27196201756710491, 352145117477485743 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A201847

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..52

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Sequence in context: A074006 A073963 A316277 * A057902 A042216 A042218

Adjacent sequences: A201839 A201840 A201841 * A201843 A201844 A201845

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 06 2011

STATUS

approved

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Last modified January 28 01:36 EST 2023. Contains 359849 sequences. (Running on oeis4.)