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A240887 Number of n X n 0..2 arrays with no element equal to a different number of vertical neighbors than horizontal neighbors, with new values 0..2 introduced in row major order 0
1, 4, 57, 2362, 245268, 64074526, 41971040844, 69012323813116, 284711573170326892 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A240893

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=4

..0..1..2..1....0..1..0..1....0..1..0..0....0..1..0..2....0..1..0..2

..2..0..1..0....1..0..2..0....1..2..0..0....2..0..1..0....1..0..2..0

..0..1..2..1....0..2..1..1....0..0..1..1....0..2..0..1....2..1..0..1

..1..2..1..2....2..0..1..1....0..0..1..1....2..0..1..2....0..2..1..0

CROSSREFS

Sequence in context: A300103 A209317 A231491 * A209316 A221866 A270881

Adjacent sequences:  A240884 A240885 A240886 * A240888 A240889 A240890

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 14 2014

STATUS

approved

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Last modified January 27 17:36 EST 2022. Contains 350611 sequences. (Running on oeis4.)