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A201843 Number of zero-sum nX4 -1..1 arrays with every element equal to at least one horizontal or vertical neighbor 1
3, 97, 2019, 54773, 1566319, 47249907, 1459651671, 45844870481, 1455414376611, 46555250810519, 1497485960091173, 48374845748963503, 1568089004921104931, 50975155483748682379, 1661095734808928183917, 54241996928659097913681 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A201847

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..25

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A320513 A320517 A243155 * A278202 A246537 A057014

Adjacent sequences:  A201840 A201841 A201842 * A201844 A201845 A201846

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 06 2011

STATUS

approved

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Last modified June 24 17:58 EDT 2019. Contains 324330 sequences. (Running on oeis4.)