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A201887 Number of zero-sum nX4 -2..2 arrays with every element equal to at least one horizontal or vertical neighbor 0
5, 413, 26003, 2171313, 184247585, 16910703303, 1591685181703, 153167112074177, 14927625333671307, 1468389415886159993 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A201888

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A046274 A221700 A216089 * A301309 A218406 A217939

Adjacent sequences:  A201884 A201885 A201886 * A201888 A201889 A201890

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 06 2011

STATUS

approved

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Last modified September 26 23:44 EDT 2022. Contains 357051 sequences. (Running on oeis4.)