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A220340 Equals two maps: number of nX3 binary arrays indicating the locations of corresponding elements equal to exactly two of their king-move neighbors in a random 0..3 nX3 array 0
2, 24, 355, 3281, 28993, 242224, 1973258, 15900432, 127519660, 1021016815, 8170267047, 65367230164, 522949458612, 4183621403993, 33469026735934, 267752331337587 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A220342

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A081065 A043699 A220317 * A134805 A119702 A126804

Adjacent sequences: A220337 A220338 A220339 * A220341 A220342 A220343

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 11 2012

STATUS

approved

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Last modified November 30 15:21 EST 2022. Contains 358442 sequences. (Running on oeis4.)