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A230936 Number of white-square subarrays of (n+2) X (n+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. 0
0, 6, 34, 1242, 28216, 4092246, 318984080, 159130979900, 43562979789278, 76371552378548280, 73355302704339455588 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Diagonal of A230940.
LINKS
EXAMPLE
Some solutions for n=4
..0..x..2..x..0..x....0..x..0..x..0..x....0..x..2..x..2..x....0..x..2..x..0..x
..x..1..x..3..x..1....x..1..x..1..x..3....x..1..x..3..x..1....x..1..x..3..x..1
..0..x..2..x..2..x....2..x..2..x..0..x....0..x..2..x..0..x....0..x..2..x..2..x
..x..3..x..1..x..1....x..3..x..1..x..3....x..3..x..3..x..1....x..1..x..1..x..1
..2..x..0..x..2..x....0..x..2..x..0..x....2..x..0..x..2..x....0..x..0..x..0..x
..x..3..x..3..x..1....x..1..x..1..x..3....x..1..x..3..x..1....x..3..x..3..x..3
CROSSREFS
Cf. A230940.
Sequence in context: A262104 A161323 A003423 * A230941 A359571 A145000
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 01 2013
STATUS
approved

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Last modified May 21 08:56 EDT 2024. Contains 372733 sequences. (Running on oeis4.)