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A186954 1/729 the number of (n+2)X3 0..2 arrays with each 3X3 subblock trace equal to some horizontal or vertical neighbor 3X3 subblock trace 1
0, 141, 831, 19881, 201495, 3281361, 40300479, 582004185, 7640173839, 105998979105, 1423752376935, 19487836291857, 263820169007487, 3594541860488409, 48792090150495183, 663751831202719713 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 1 of A186962

LINKS

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

FORMULA

Empirical: a(n)=17*a(n-1)-51*a(n-2)-331*a(n-3)+7181*a(n-4)-31635*a(n-5)+101790*a(n-6)-106596*a(n-7)+95256*a(n-8)

EXAMPLE

Some solutions for 4X3

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

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

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

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

CROSSREFS

Sequence in context: A228597 A255154 A068046 * A235760 A201814 A235543

Adjacent sequences:  A186951 A186952 A186953 * A186955 A186956 A186957

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 01 2011

STATUS

approved

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Last modified January 24 15:43 EST 2022. Contains 350540 sequences. (Running on oeis4.)