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A220341 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..3 nX4 array 0
4, 89, 3281, 60003, 1022813, 16673578 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A220342

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A262409 A183880 A220318 * A184955 A205295 A292304

Adjacent sequences:  A220338 A220339 A220340 * A220342 A220343 A220344

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 11 2012

STATUS

approved

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Last modified March 21 07:23 EDT 2019. Contains 321367 sequences. (Running on oeis4.)