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A220429 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..3 nX4 array 0
4, 94, 2103, 40412, 735555, 12702453, 213282872, 3513823635 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A220430

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A061992 A221389 A220374 * A210857 A220682 A210926

Adjacent sequences:  A220426 A220427 A220428 * A220430 A220431 A220432

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 14 2012

STATUS

approved

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Last modified January 25 23:56 EST 2022. Contains 350572 sequences. (Running on oeis4.)