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A222885 Number of nX2 0..2 arrays with exactly floor(nX2/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order 2
0, 4, 22, 184, 1222, 9918, 73038, 571736, 4390202, 34351802, 267982304, 2106587634, 16576619646, 130932847630, 1036002954358, 8216574460288, 65272910779558, 519408134342898, 4138939523056050, 33024940436137874, 263814619538403032 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A222889

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A259842 A125863 A004115 * A235329 A220231 A112370

Adjacent sequences:  A222882 A222883 A222884 * A222886 A222887 A222888

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 08 2013

STATUS

approved

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Last modified December 7 13:08 EST 2021. Contains 349581 sequences. (Running on oeis4.)