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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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 16 2013
STATUS
approved

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Last modified February 26 19:43 EST 2024. Contains 370352 sequences. (Running on oeis4.)