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A222491 Number of 4Xn 0..2 arrays with exactly floor(4Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..2 order 0
0, 13, 85, 270, 2373, 17095, 145019, 1271237, 12273588, 113823904, 1131311866, 10543094777, 105359579523, 985710462356, 9862145116373, 92538102045091, 925649183459093 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A222488

LINKS

Table of n, a(n) for n=1..17.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A321589 A225129 A297207 * A010025 A001848 A055843

Adjacent sequences:  A222488 A222489 A222490 * A222492 A222493 A222494

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 22 2013

STATUS

approved

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Last modified January 26 09:35 EST 2022. Contains 350598 sequences. (Running on oeis4.)