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A183815 1/81 the number of (n+1) X 5 0..2 arrays with no 2 X 2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor. 0
512, 65640, 8231592, 1042063656, 131467169720, 16607782066704, 2096961683069192, 264820293988996048, 33441129238755694072, 4223013161022170839808, 533285078101618075961512 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A183819.
LINKS
EXAMPLE
Some solutions with upper left block zero for 3 X 5
..0..0..2..0..2....0..0..1..1..2....0..0..1..2..0....0..0..2..2..2
..0..0..2..2..1....0..0..2..1..2....0..0..1..2..1....0..0..2..1..1
..0..1..1..2..0....0..2..0..0..1....2..1..1..1..2....0..1..1..0..0
CROSSREFS
Cf. A183819.
Sequence in context: A035753 A107549 A186797 * A013701 A187461 A291461
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 07 2011
STATUS
approved

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Last modified May 28 21:13 EDT 2024. Contains 372920 sequences. (Running on oeis4.)