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A186134 Number of (n+1)X3 0..2 arrays with no 2X2 subblock trace equal to any horizontal or vertical neighbor 2X2 subblock trace 1
558, 7686, 107874, 1512792, 21216780, 297562572, 4173269994, 58529531286, 820868250834, 11512560545838, 161462017434114, 2264481777843414, 31759033884174810, 445415920910137998, 6246894759422576778 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A186141

LINKS

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

FORMULA

Empirical: a(n)=5*a(n-1)+114*a(n-2)+216*a(n-3)-524*a(n-4)-516*a(n-5)+876*a(n-6)-276*a(n-7)+216*a(n-8)-72*a(n-9)

EXAMPLE

Some solutions for 5X3

..0..0..1....0..0..0....0..0..1....0..0..0....0..0..0....0..0..0....0..0..1

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

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

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

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

CROSSREFS

Sequence in context: A253478 A253483 A185772 * A050254 A139197 A136346

Adjacent sequences:  A186131 A186132 A186133 * A186135 A186136 A186137

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 13 2011

STATUS

approved

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Last modified October 24 18:08 EDT 2021. Contains 348233 sequences. (Running on oeis4.)