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A186878 Number of (n+2)X8 0..3 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock 1
186096, 18517, 32992, 108640, 230224, 287368, 338176, 414184, 568744, 927136, 1492600, 2387392, 4046104, 6975931, 11357422, 19105849, 32364013, 52661545, 88036021, 148729189, 243684934, 407116792, 686279218, 1129121971, 1883516491 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 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>14

EXAMPLE

Some solutions for 4X8

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

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

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

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

CROSSREFS

Sequence in context: A032748 A180099 A092013 * A192103 A203442 A216901

Adjacent sequences:  A186875 A186876 A186877 * A186879 A186880 A186881

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 28 2011

STATUS

approved

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Last modified August 26 01:44 EDT 2019. Contains 326324 sequences. (Running on oeis4.)