

A229589


Number of defective 3colorings of a 4 X n 0..2 array connected horizontally and antidiagonally with exactly one mistake, and colors introduced in rowmajor 0..2 order.


1



0, 224, 2160, 19764, 167364, 1375152, 11035044, 87040260, 677327004, 5213798784, 39777273072, 301217858676, 2266655495148, 16964398022220, 126372108661164, 937513290523896, 6929886363153768, 51058923535878660, 375112065125492964
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OFFSET

1,2


COMMENTS



LINKS



FORMULA

Empirical: a(n) = 18*a(n1)  111*a(n2) + 282*a(n3)  333*a(n4) + 180*a(n5)  36*a(n6) for n > 12.


EXAMPLE

Some solutions for n=3:
0 1 0 0 0 1 0 1 0 0 1 0 0 1 0 0 1 2 0 0 1
2 2 1 2 0 1 2 2 0 2 2 1 0 2 2 2 0 2 1 0 2
1 0 1 1 2 1 0 2 1 0 2 0 0 1 2 1 0 1 2 1 2
2 0 2 0 2 0 0 2 1 0 2 0 2 0 2 2 2 0 0 1 0


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



