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A230939 Number of white-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
42, 1312, 8450, 208172, 1604098, 41991510, 318984080, 8279222070, 62983913970, 1636647076866, 12449868229094, 323476245049122, 2460739904000374, 63937066423053164, 486382045071603570, 12637596474609429472 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 7 of A230940
LINKS
EXAMPLE
Some solutions for n=4
..0..x..2..x..2..x..0..x..2....0..x..0..x..0..x..2..x..2
..x..1..x..3..x..1..x..3..x....x..1..x..3..x..1..x..3..x
..0..x..0..x..2..x..2..x..2....0..x..2..x..0..x..0..x..2
..x..3..x..1..x..3..x..0..x....x..3..x..1..x..1..x..3..x
..2..x..0..x..0..x..1..x..3....0..x..2..x..2..x..0..x..2
..x..1..x..3..x..3..x..2..x....x..1..x..1..x..3..x..3..x
CROSSREFS
Sequence in context: A001778 A111780 A075922 * A331858 A331805 A348775
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 01 2013
STATUS
approved

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Last modified May 30 14:34 EDT 2024. Contains 372968 sequences. (Running on oeis4.)