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A220318 Equals two maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly two of their king-move neighbors in a random 0..2 nX4 array 0
4, 89, 3167, 56819, 984087, 16290350, 264901883 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A220319

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A235858 A262409 A183880 * A220341 A184955 A205295

Adjacent sequences:  A220315 A220316 A220317 * A220319 A220320 A220321

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 10 2012

STATUS

approved

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Last modified March 25 15:02 EDT 2019. Contains 321470 sequences. (Running on oeis4.)