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A237559 Number of (n+1)X(n+1) 0..2 arrays with the upper median plus the lower median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 0
81, 1536, 44828, 2161168, 159014170, 18615658788, 3615152813462, 1107896271684848 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Diagonal of A237567
LINKS
EXAMPLE
Some solutions for n=3
..1..1..0..0....0..1..2..2....0..1..2..2....0..2..1..0....1..2..0..2
..1..2..2..2....1..0..1..1....0..1..1..1....2..2..1..2....0..0..2..1
..2..0..0..1....1..2..0..1....1..2..2..1....1..1..0..0....2..0..1..1
..1..1..1..2....0..2..0..1....2..0..0..2....1..0..1..0....1..0..0..0
CROSSREFS
Sequence in context: A236867 A203650 A284057 * A223279 A096302 A297681
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 09 2014
STATUS
approved

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Last modified July 23 18:56 EDT 2024. Contains 374553 sequences. (Running on oeis4.)