A186167 - OEIS

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A186167

1/4 the number of nX8 0..3 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors

0

97, 677283, 1610684397, 4840082975532, 13435825601048421, 38514280297010210802

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 8 of A186168

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for 3X8 with a(1,1)=0

..0..0..0..0..2..1..1..0....0..0..0..0..3..0..3..3....0..0..0..0..0..3..3..0

..0..1..1..2..2..3..1..0....0..1..1..0..3..0..0..3....0..1..1..2..2..1..0..0

..0..0..0..0..0..3..3..0....0..0..0..0..3..3..0..0....0..0..0..0..2..1..3..3

CROSSREFS

Sequence in context: A193825 A338779 A209475 * A322606 A145309 A122128

Adjacent sequences: A186164 A186165 A186166 * A186168 A186169 A186170

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 13 2011

STATUS

approved