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A199650 Number of nX3 0..2 arrays with values 0..2 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors 1
5, 113, 2584, 59212, 1357484, 31120632, 713445976, 16355879648, 374961537040, 8596061907680, 197066293538400, 4517780870646656, 103570953858672192, 2374383085485820032, 54433167085958461312, 1247890324488906825728 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A199655

LINKS

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

FORMULA

Empirical: a(n) = 21*a(n-1) +44*a(n-2) +8*a(n-3) -96*a(n-4) -364*a(n-5) -264*a(n-6) +256*a(n-7) +288*a(n-8) +64*a(n-9) for n>10

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A224897 A086805 A163014 * A241109 A208317 A279836

Adjacent sequences: A199647 A199648 A199649 * A199651 A199652 A199653

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 08 2011

STATUS

approved

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Last modified January 30 22:27 EST 2023. Contains 359947 sequences. (Running on oeis4.)