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A196916
Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 1,3,2,4,0 for x=0,1,2,3,4
0
1, 2, 7, 37, 602, 18354, 1272060, 208122448, 79321631051, 70822976472060, 147945365445395494, 721450315462495908444
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 4's, every 4 is next to 4 0's
Diagonal of A196922
EXAMPLE
Some solutions for n=4
..2..2..2..0....0..0..0..0....0..2..2..2....2..2..2..2....0..0..0..0
..2..0..2..0....2..2..2..2....0..2..0..2....2..0..0..2....0..0..0..0
..2..0..2..0....2..0..0..2....0..2..0..2....2..2..2..2....2..2..0..0
..2..2..2..0....2..2..2..2....0..2..2..2....0..0..0..0....2..2..0..0
CROSSREFS
Sequence in context: A102743 A195068 A342412 * A182331 A173762 A180269
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 07 2011
STATUS
approved