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A252953 Number of (n+2)X(n+2) 0..4 arrays with every consecutive three elements in every row and diagonal having exactly two distinct values, and in every column and antidiagonal not having exactly two distinct values, and new values 0 upwards introduced in row major order 0
60, 120, 259, 674, 1747, 5100, 12573, 33929, 96273, 254784, 702943, 2032001 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Diagonal of A252961
LINKS
EXAMPLE
Some solutions for n=2
..0..0..1..0....0..1..1..2....0..1..1..2....0..1..0..0....0..1..0..0
..2..3..3..0....1..3..3..4....1..0..1..0....0..0..1..0....0..0..2..2
..4..4..0..0....2..0..0..1....3..3..1..3....0..2..2..0....0..3..3..1
..0..0..2..0....4..1..1..0....2..2..1..1....0..1..0..0....0..1..0..0
CROSSREFS
Sequence in context: A177871 A334382 A337098 * A309315 A275339 A049058
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 25 2014
STATUS
approved

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Last modified March 28 13:41 EDT 2024. Contains 371254 sequences. (Running on oeis4.)