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A230615 Number of 3Xn 0..2 arrays x(i,j) with each element horizontally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero 1
0, 0, 0, 30, 260, 2358, 20430, 176774, 1527918, 13204026, 114099558, 985963206, 8519922122, 73622499446, 636187953758, 5497437822074, 47504550336526, 410497104019406, 3547194348471034, 30652074338152030, 264871210587660230 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Row 3 of A230614

LINKS

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

FORMULA

Empirical: a(n) = 15*a(n-1) -64*a(n-2) +61*a(n-3) +181*a(n-4) -210*a(n-5) -679*a(n-6) +577*a(n-7) +2166*a(n-8) -2571*a(n-9) -789*a(n-10) +760*a(n-11) +618*a(n-12) +264*a(n-13) +56*a(n-14) for n>17

EXAMPLE

Some solutions for n=4

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

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

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

CROSSREFS

Sequence in context: A024448 A125367 A126525 * A230731 A053358 A163667

Adjacent sequences:  A230612 A230613 A230614 * A230616 A230617 A230618

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 25 2013

STATUS

approved

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Last modified March 8 07:30 EST 2021. Contains 341941 sequences. (Running on oeis4.)