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A222270 Number of nX2 0..3 arrays with exactly floor(nX2/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order 2
0, 0, 4, 13, 40, 162, 888, 3617, 18136, 81560, 407644, 1901375, 9349056, 44712494, 218395880, 1057844425, 5154076928, 25146813236, 122532346416, 600293886818, 2928771248408, 14383619678744, 70298507431888, 345790800489643 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 2 of A222275

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

All solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A034742 A149424 A097112 * A213496 A220926 A077284

Adjacent sequences:  A222267 A222268 A222269 * A222271 A222272 A222273

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 14 2013

STATUS

approved

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Last modified February 21 03:06 EST 2019. Contains 320364 sequences. (Running on oeis4.)