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A185901 1/8 the number of nX4 0..7 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors 0
8, 2765, 546280, 139230658, 32611077940, 7921723799549, 1897334511466261, 457135757368429048, 109875454057222039886, 26435697398605508731039, 6357732815393016703934708, 1529282331683348275213637905 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A185903

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for 3X4 with a(1,1)=0

..0..4..4..3....0..0..6..6....0..4..1..0....0..0..4..5....0..0..5..4

..0..0..1..3....2..0..3..3....0..4..1..0....4..0..4..5....0..6..5..4

..6..6..1..1....2..2..2..3....7..7..2..2....4..0..3..3....0..6..3..3

CROSSREFS

Sequence in context: A233122 A017547 A046248 * A078525 A280282 A125539

Adjacent sequences:  A185898 A185899 A185900 * A185902 A185903 A185904

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 06 2011

STATUS

approved

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Last modified May 18 23:08 EDT 2021. Contains 344008 sequences. (Running on oeis4.)