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A205409 Number of (n+2)X4 0..2 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly two ways, and new values 0..2 introduced in row major order 1
3868, 44596, 549414, 5686031, 64878898, 768581101, 8606465750, 98080551694, 1133347809296, 12914400827409, 147488385577992, 1691863713691698, 19345357758536500, 221200783159493283, 2532531552219620474 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A205415

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

..1..1..1..2....1..2..2..2....1..1..1..1....2..2..2..2....2..2..2..1

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

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

CROSSREFS

Sequence in context: A220752 A257780 A068267 * A103117 A204791 A204784

Adjacent sequences:  A205406 A205407 A205408 * A205410 A205411 A205412

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 26 2012

STATUS

approved

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Last modified September 19 03:31 EDT 2021. Contains 347550 sequences. (Running on oeis4.)