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A220240 Equals two maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and vertical neighbors in a random 0..1 nX4 array 0
4, 78, 1131, 14976, 219617, 3101079, 43677639, 613533257 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A220242

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=3

..0..0..1..1....0..0..0..0....0..1..0..0....0..1..0..0....1..1..1..0

..0..0..0..0....1..0..1..1....0..1..0..1....1..0..1..0....0..1..1..0

..1..0..0..0....0..0..0..1....1..0..0..0....0..0..1..0....0..0..1..0

CROSSREFS

Sequence in context: A210519 A279437 A296997 * A246606 A210903 A054951

Adjacent sequences:  A220237 A220238 A220239 * A220241 A220242 A220243

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 08 2012

STATUS

approved

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Last modified June 21 14:17 EDT 2021. Contains 345364 sequences. (Running on oeis4.)