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A198599 Number of 2nX6 0..3 arrays with values 0..3 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors 1
2, 32, 674, 14396, 309770, 6671450, 143724590, 3096625676, 66720604082, 1437592096184, 30975107870150, 667406503209962, 14380307969705594, 309846066281809304, 6676114885818492290, 143847269049688259540 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A198604

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n) = 27*a(n-1) -107*a(n-2) -164*a(n-3) -1701*a(n-4) +7073*a(n-5) +13206*a(n-6) +22329*a(n-7) -67473*a(n-8) -190188*a(n-9) -20655*a(n-10) +60507*a(n-11) +177147*a(n-12)

EXAMPLE

Some solutions for n=4

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

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

..2..2..0..0..3..3....1..1..2..2..0..0....2..2..3..3..1..1....1..1..0..0..3..3

..2..2..0..0..3..3....1..1..2..2..0..0....2..2..3..3..1..1....1..1..0..0..3..3

..0..0..2..2..1..1....2..2..0..0..3..3....0..0..1..1..0..0....3..3..1..1..0..0

..0..0..2..2..1..1....2..2..0..0..3..3....0..0..1..1..0..0....3..3..1..1..0..0

..3..3..1..1..3..3....1..1..3..3..1..1....1..1..0..0..2..2....1..1..2..2..3..3

..3..3..1..1..3..3....1..1..3..3..1..1....1..1..0..0..2..2....1..1..2..2..3..3

CROSSREFS

Sequence in context: A038394 A068110 A304860 * A009517 A202408 A069182

Adjacent sequences:  A198596 A198597 A198598 * A198600 A198601 A198602

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 27 2011

STATUS

approved

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Last modified October 25 11:10 EDT 2021. Contains 348240 sequences. (Running on oeis4.)