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A196803
Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,2,3,0,1 for x=0,1,2,3,4.
0
1, 1, 16, 193, 19449, 2535368, 1436535356, 2099296647197, 9043086011797968, 109561680407727718539
OFFSET
1,3
COMMENTS
Every 0 is next to 0 4's, every 1 is next to 1 2's, every 2 is next to 2 3's, every 3 is next to 3 0's, every 4 is next to 4 1's.
Diagonal of A196809.
EXAMPLE
Some solutions for n=4
..0..0..0..0....0..0..1..0....0..3..0..0....0..1..0..0....0..3..0..0
..0..3..0..0....0..3..2..0....0..0..0..0....0..2..3..0....0..0..3..0
..1..2..3..0....3..0..3..0....3..0..0..3....0..3..0..3....0..0..3..0
..0..0..0..0....0..3..0..0....0..0..0..0....0..0..0..0....0..3..0..0
CROSSREFS
Cf. A196809.
Sequence in context: A374070 A016178 A081202 * A292785 A081185 A159517
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 06 2011
STATUS
approved