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A186880 Number of (n+2)X10 0..3 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock 1
322910, 25381, 46624, 148048, 310528, 414184, 571984, 801208, 1130584, 1842208, 3014488, 4813744, 8147608, 13457800, 21637048, 37154419, 62117614, 101085745, 172069837, 287321977, 469126669, 793531357, 1325629774, 2174290240 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 8 of A186881

LINKS

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

FORMULA

Empirical: a(n)=2*a(n-1)-a(n-2)+3*a(n-3)-6*a(n-4)+3*a(n-5)+3*a(n-6)-3*a(n-7) for n>16

EXAMPLE

Some solutions for 4X10

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

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

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

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

CROSSREFS

Sequence in context: A236318 A097937 A244565 * A114667 A233978 A263154

Adjacent sequences:  A186877 A186878 A186879 * A186881 A186882 A186883

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 28 2011

STATUS

approved

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Last modified September 16 08:36 EDT 2019. Contains 327091 sequences. (Running on oeis4.)