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A163725 Number of nX4 binary arrays with all 1s connected, a path of 1s from left column to right column, and no 1 having more than two 1s adjacent 0
1, 16, 108, 531, 2119, 7338, 23330, 70369, 204461, 576824, 1589880, 4304373, 11495305, 30376964, 79611466, 207289163, 536963245 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..17.

EXAMPLE

All solutions for n=2

...1.1.1.1...1.1.1.1...1.1.1.1...1.1.1.1...0.0.0.0...0.0.0.1...1.0.0.0

...0.0.0.0...0.0.0.1...1.0.0.0...1.0.0.1...1.1.1.1...1.1.1.1...1.1.1.1

------

...1.0.0.1...1.1.0.0...1.1.0.1...1.1.1.0...1.1.1.0...0.0.1.1...1.0.1.1

...1.1.1.1...0.1.1.1...0.1.1.1...0.0.1.1...1.0.1.1...1.1.1.0...1.1.1.0

------

...0.1.1.1...0.1.1.1

...1.1.0.0...1.1.0.1

CROSSREFS

Sequence in context: A224411 A260357 A056001 * A269188 A165558 A337391

Adjacent sequences:  A163722 A163723 A163724 * A163726 A163727 A163728

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 03 2009

STATUS

approved

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Last modified August 14 18:13 EDT 2022. Contains 356122 sequences. (Running on oeis4.)