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A229471
Number of defective 4-colorings of an n X n 0..3 array connected horizontally, antidiagonally and vertically with exactly one mistake, and colors introduced in row-major 0..3 order.
0
0, 6, 420, 36116, 5068384, 1317269920, 670127758336, 686446917153024, 1439114626511742976, 6238265946576239106048
OFFSET
1,2
COMMENTS
Diagonal of A229479.
EXAMPLE
Some solutions for n=4:
0 1 0 2 0 1 2 0 0 1 2 2 0 1 2 0 0 1 0 2
2 3 1 3 2 3 1 2 3 0 3 1 2 3 1 2 2 0 1 0
1 3 0 1 1 0 3 0 1 2 0 2 1 2 0 1 3 2 3 1
0 2 3 0 2 1 0 2 0 1 3 0 0 1 0 2 0 1 0 3
CROSSREFS
Cf. A229479.
Sequence in context: A159015 A106206 A174773 * A258192 A273820 A162088
KEYWORD
nonn
AUTHOR
R. H. Hardin, Sep 24 2013
STATUS
approved