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A185767 Number of (n+1)X8 binary arrays with no 2X2 subblock trace equal to any horizontal or vertical neighbor 2X2 subblock trace 1
4456, 32456, 284256, 2680000, 27172072, 278758936, 2886249088, 29857704328, 309306410040, 3201277096848, 33150509602128, 343172969266424, 3553243907663632, 36786039676544160, 380867398106326120 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A185769

LINKS

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

FORMULA

Empirical: a(n)=a(n-1)+98*a(n-2)+145*a(n-3)-1606*a(n-4)-1043*a(n-5)+9813*a(n-6)-11042*a(n-7)-14222*a(n-8)+67346*a(n-9)-40216*a(n-10)-64047*a(n-11)+36082*a(n-12)+29210*a(n-13)+8981*a(n-14)-23650*a(n-15)-12520*a(n-16)+7365*a(n-17)+448*a(n-18)-196*a(n-19) for n>24

EXAMPLE

Some solutions for 3X8

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

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

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

CROSSREFS

Sequence in context: A253697 A253704 A235015 * A089202 A250977 A289513

Adjacent sequences:  A185764 A185765 A185766 * A185768 A185769 A185770

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 03 2011

STATUS

approved

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Last modified May 25 22:51 EDT 2022. Contains 354073 sequences. (Running on oeis4.)