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A201843
Number of zero-sum n X 4 -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
OFFSET
1,1
COMMENTS
Column 4 of A201847.
LINKS
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
Cf. A201847.
Sequence in context: A320517 A348491 A243155 * A278202 A246537 A057014
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 06 2011
STATUS
approved