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A229640 Number of defective 3-colorings of a 4Xn 0..2 array connected horizontally, diagonally and antidiagonally with exactly two mistakes, and colors introduced in row-major 0..2 order 1
0, 202, 1496, 10227, 77620, 535671, 3723370, 25022190, 166505166, 1090285513, 7066637900, 45333775056, 288422981684, 1821192582307, 11424271291526, 71241698297248, 441922120307156, 2728236364222397, 16770150954151850 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A229637

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-1) +21*a(n-2) -270*a(n-3) -357*a(n-4) +2967*a(n-5) +4906*a(n-6) -10083*a(n-7) -18957*a(n-8) +15750*a(n-9) +31293*a(n-10) -13335*a(n-11) -23929*a(n-12) +6426*a(n-13) +7824*a(n-14) -1336*a(n-15) -1152*a(n-16) +96*a(n-17) +64*a(n-18) for n>21

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A260280 A252993 A252987 * A221892 A332120 A064100

Adjacent sequences:  A229637 A229638 A229639 * A229641 A229642 A229643

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 27 2013

STATUS

approved

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Last modified February 25 08:21 EST 2020. Contains 332221 sequences. (Running on oeis4.)