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A223144 Number of nX2 0..2 arrays with no more than floor(nX2/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order 1
1, 7, 31, 187, 990, 5721, 32155, 185667, 1068413, 6209614, 36152732, 211488161, 1240108650, 7292753853, 42976317875, 253780411459, 1501160467318, 8893657851979, 52763660745169, 313428125418614, 1863953435747000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A223149

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..192

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A139151 A139060 A324621 * A155521 A201116 A329944

Adjacent sequences:  A223141 A223142 A223143 * A223145 A223146 A223147

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 16 2013

STATUS

approved

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Last modified May 30 11:01 EDT 2020. Contains 334724 sequences. (Running on oeis4.)