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A163689 Number of nX6 binary arrays with all 1s connected, a path of 1s from upper left corner to lower right corner, and no 1 having more than two 1s adjacent 0
1, 20, 175, 1095, 5808, 27874, 132950, 650001, 3195383, 15423592 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

All solutions for n=2

...1.0.0.0.0.0...1.0.0.0.0.1...1.1.0.0.0.0...1.1.0.0.0.1...1.1.1.0.0.0

...1.1.1.1.1.1...1.1.1.1.1.1...0.1.1.1.1.1...0.1.1.1.1.1...0.0.1.1.1.1

------

...1.1.1.0.0.0...1.1.1.0.0.1...1.1.1.0.0.1...1.1.1.1.0.0...1.1.1.1.0.0

...1.0.1.1.1.1...0.0.1.1.1.1...1.0.1.1.1.1...0.0.0.1.1.1...1.0.0.1.1.1

------

...1.1.1.1.0.1...1.1.1.1.0.1...1.1.1.1.1.0...1.1.1.1.1.0...1.1.1.1.1.1

...0.0.0.1.1.1...1.0.0.1.1.1...0.0.0.0.1.1...1.0.0.0.1.1...0.0.0.0.0.1

------

...1.1.1.1.1.1...1.0.0.1.1.1...1.0.1.1.1.0...1.0.1.1.1.1...1.1.0.1.1.1

...1.0.0.0.0.1...1.1.1.1.0.1...1.1.1.0.1.1...1.1.1.0.0.1...0.1.1.1.0.1

CROSSREFS

Sequence in context: A056128 A027791 A047819 * A342387 A140044 A027332

Adjacent sequences:  A163686 A163687 A163688 * A163690 A163691 A163692

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 03 2009

STATUS

approved

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Last modified January 22 00:08 EST 2022. Contains 350481 sequences. (Running on oeis4.)