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A230588 Number of nX2 0..5 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 6, and upper left element zero 2
0, 0, 2, 8, 30, 120, 506, 2144, 9030, 37920, 159218, 668792, 2809710, 11804040, 49589354, 208325456, 875178390, 3676643760, 15445668962, 64887621608, 272594409150, 1145175432600, 4810908576986, 20210738740544, 84905783253990 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 2 of A230592

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-1) -5*a(n-2) +5*a(n-3) +8*a(n-4).

Empirical: G.f. 2*x^3*(-1+x) / ( -1+5*x-5*x^2+5*x^3+8*x^4 ). - R. J. Mathar, Oct 27 2013

EXAMPLE

All solutions for n=4

..0..5....0..1....0..5....0..1....0..5....0..1....0..5....0..1

..1..4....1..2....1..4....5..2....1..0....5..2....1..2....3..2

..2..3....0..3....2..3....4..3....2..5....4..3....0..3....4..1

..1..0....5..4....1..2....1..2....3..4....3..2....5..4....5..0

CROSSREFS

Sequence in context: A133915 A150759 A150760 * A151303 A150761 A150762

Adjacent sequences:  A230585 A230586 A230587 * A230589 A230590 A230591

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 24 2013

STATUS

approved

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Last modified July 19 12:35 EDT 2019. Contains 325159 sequences. (Running on oeis4.)