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A187132 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces 0
0, 1773, 267840, 201302208, 440941355208, 3703181282209854 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Diagonal of A187140
LINKS
EXAMPLE
Some solutions for 4X4
..0..1..1..0....0..1..2..0....2..1..1..0....1..0..2..0....2..1..1..0
..1..1..1..1....1..2..2..2....2..1..0..0....2..1..1..1....1..1..2..2
..1..0..0..0....0..1..1..2....0..1..0..1....0..0..0..2....2..2..1..0
..0..1..2..2....0..2..2..2....1..2..1..2....2..2..1..1....0..2..2..1
CROSSREFS
Sequence in context: A221118 A155023 A176478 * A185836 A047826 A143995
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 05 2011
STATUS
approved

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Last modified March 1 20:05 EST 2024. Contains 370443 sequences. (Running on oeis4.)