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A229639 Number of defective 3-colorings of a 3Xn 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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 3 of A229637

LINKS

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

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) +48*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 A327344 A190537

Adjacent sequences:  A229636 A229637 A229638 * A229640 A229641 A229642

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 27 2013

STATUS

approved

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Last modified February 17 12:10 EST 2020. Contains 331996 sequences. (Running on oeis4.)