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A196629 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 1,3,2,0,4 for x=0,1,2,3,4 0
1, 2, 21, 327, 17278, 2140040, 651323279, 497248017421, 944403244013788, 4486207626875690795 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Every 0 is next to 0 1's, every 1 is next to 1 3's, every 2 is next to 2 2's, every 3 is next to 3 0's, every 4 is next to 4 4's
Diagonal of A196636
LINKS
EXAMPLE
Some solutions for n=4
..0..2..2..0....0..0..3..0....2..2..0..0....0..0..0..0....0..2..2..0
..0..2..2..0....0..0..0..0....2..2..0..0....0..0..0..3....0..2..2..0
..0..3..0..3....2..2..3..0....0..0..0..0....3..0..0..0....0..0..0..3
..0..0..3..0....2..2..0..0....0..0..3..0....0..0..3..0....0..0..3..0
CROSSREFS
Sequence in context: A234525 A230382 A189489 * A196637 A240997 A241247
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 04 2011
STATUS
approved

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Last modified May 29 13:31 EDT 2024. Contains 372940 sequences. (Running on oeis4.)