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A229696 Number of defective 3-colorings of a 3Xn 0..2 array connected horizontally and antidiagonally with exactly two mistakes, and colors introduced in row-major 0..2 order 1
0, 40, 626, 5077, 35825, 230383, 1400413, 8184819, 46455457, 257724695, 1403839397, 7532391243, 39908047865, 209177764015, 1086276818845, 5595663437379, 28620024582289, 145460267764487, 735134318022101 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 3 of A229694

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 15*a(n-1) -81*a(n-2) +185*a(n-3) -162*a(n-4) +60*a(n-5) -8*a(n-6) for n>10

EXAMPLE

Some solutions for n=3

..0..1..0....0..1..0....0..1..1....0..0..1....0..1..0....0..1..0....0..1..0

..0..1..1....2..0..0....1..2..0....0..2..0....1..2..0....0..1..2....2..0..2

..2..1..0....2..1..2....0..2..1....0..1..2....1..1..2....1..2..1....1..1..0

CROSSREFS

Sequence in context: A002847 A057808 A269778 * A247410 A183464 A189286

Adjacent sequences:  A229693 A229694 A229695 * A229697 A229698 A229699

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 27 2013

STATUS

approved

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Last modified June 2 11:35 EDT 2020. Contains 334771 sequences. (Running on oeis4.)