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A229639
Number of defective 3-colorings of a 3 X n 0..2 array connected horizontally, diagonally and antidiagonally with exactly two mistakes, and colors introduced in row-major 0..2 order.
1
0, 39, 244, 1109, 6031, 28448, 136778, 633328, 2905016, 13118016, 58633648, 259523840, 1139461984, 4967050352, 21516000592, 92679568016, 397212173264, 1694694809008, 7200709256752, 30481238674128, 128588345884944
OFFSET
1,2
COMMENTS
Row 3 of A229637.
LINKS
FORMULA
Empirical: a(n) = 9*a(n-1) - 15*a(n-2) - 51*a(n-3) + 96*a(n-4) + 138*a(n-5) - 92*a(n-6) - 60*a(n-7) +4 8*a(n-8) - 8*a(n-9) for n > 12.
EXAMPLE
Some solutions for n=3:
0 1 1 0 0 1 0 1 2 0 1 0 0 1 0 0 1 0 0 1 2
2 1 0 1 2 1 0 1 0 1 2 1 2 1 0 2 1 0 0 1 2
2 1 0 1 0 0 1 2 1 1 0 1 1 1 0 1 2 0 1 0 2
CROSSREFS
Sequence in context: A190538 A190606 A101627 * A070146 A372930 A327344
KEYWORD
nonn
AUTHOR
R. H. Hardin, Sep 27 2013
STATUS
approved