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A277768 Number of 3Xn 0..2 arrays with every element equal to some element at offset (-1,-1) (-1,0) (-1,1) (0,-1) (0,1) or (1,0) both plus 1 mod 3 and minus 1 mod 3, with new values introduced in order 0..2. 1
0, 2, 17, 204, 1989, 21141, 220549, 2292380, 23911889, 249253583, 2597767946, 27078215723, 282249897665, 2942003150449, 30665850885332, 319644266438138, 3331797339053418, 34728844714392948, 361994612635214032 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 3 of A277767.

LINKS

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

FORMULA

Empirical: a(n) = 11*a(n-1) -a(n-2) +10*a(n-3) -648*a(n-4) -323*a(n-5) +2443*a(n-6) +9234*a(n-7) -2121*a(n-8) +1974*a(n-9) -6288*a(n-10) +2781*a(n-11) -4959*a(n-12) +757*a(n-13) -898*a(n-14) +2180*a(n-15) +116*a(n-16) +44*a(n-17) -288*a(n-18)

EXAMPLE

Some solutions for n=4

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

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

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

CROSSREFS

Cf. A277767.

Sequence in context: A348766 A126752 A234461 * A333990 A349654 A004029

Adjacent sequences:  A277765 A277766 A277767 * A277769 A277770 A277771

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 29 2016

STATUS

approved

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Last modified July 5 04:40 EDT 2022. Contains 355087 sequences. (Running on oeis4.)