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A229748
Number of defective 4-colorings of an n X n 0..3 array connected horizontally, vertically, diagonally and antidiagonally with exactly two mistakes, and colors introduced in row-major 0..3 order.
0
0, 3, 598, 6561, 29776, 102271, 314700, 914039, 2561548, 6994695, 18701748, 49101007, 126846084, 322964975, 811594012, 2015425287, 4951261596
OFFSET
1,2
COMMENTS
Diagonal of A229755.
EXAMPLE
Some solutions for n=4:
0 0 1 0 0 0 1 0 0 1 2 2 0 1 2 0 0 1 0 2
2 3 2 3 1 2 3 2 2 3 0 1 2 0 3 1 3 2 3 1
0 1 0 1 3 0 1 0 0 1 2 3 3 1 0 2 1 0 1 2
3 3 2 3 0 2 3 2 3 2 0 1 0 2 3 1 2 2 3 0
CROSSREFS
Sequence in context: A264675 A203748 A329706 * A368685 A225761 A140029
KEYWORD
nonn,more
AUTHOR
R. H. Hardin, Sep 28 2013
STATUS
approved