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A230934 Number of black-square subarrays of (n+2)X(7+2) 0..3 arrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero 1
208, 1312, 27106, 208172, 5528862, 41991510, 1088383766, 8279222070, 215159062492, 1636647076866, 42522830419102, 323476245049122, 8404831728294292, 63937066423053164, 1661266085981748266 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 7 of A230935
LINKS
EXAMPLE
Some solutions for n=4
..x..0..x..0..x..0..x..2..x....x..0..x..0..x..0..x..0..x
..3..x..1..x..1..x..1..x..3....3..x..1..x..3..x..1..x..2
..x..2..x..2..x..2..x..0..x....x..2..x..0..x..2..x..3..x
..1..x..3..x..1..x..3..x..3....1..x..1..x..1..x..0..x..2
..x..0..x..2..x..2..x..2..x....x..2..x..0..x..3..x..1..x
..3..x..1..x..1..x..1..x..1....1..x..3..x..2..x..2..x..0
CROSSREFS
Sequence in context: A234543 A233665 A233659 * A236272 A184681 A235674
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 01 2013
STATUS
approved

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Last modified May 28 15:12 EDT 2024. Contains 372916 sequences. (Running on oeis4.)