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A163694 Number of n X n binary arrays with all 1s connected, a path of 1s from top row to lower right corner, and no 1 having more than two 1s adjacent 0
1, 5, 28, 259, 3643, 76848, 2583720 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

All solutions for n=3

...0.0.1...0.0.1...0.1.1...0.1.1...1.1.1...1.1.1...1.1.1...1.1.1...0.0.1

...0.0.1...0.0.1...0.0.1...0.0.1...0.0.1...0.0.1...1.0.1...1.0.1...0.0.1

...0.0.1...0.1.1...0.0.1...0.1.1...0.0.1...0.1.1...0.0.1...0.1.1...1.1.1

------

...0.1.1...1.1.1...1.1.1...1.1.1...0.1.0...0.1.1...1.1.0...0.1.0...1.1.0

...0.0.1...0.0.1...1.0.1...1.0.1...0.1.0...0.1.0...0.1.0...0.1.1...0.1.1

...1.1.1...1.1.1...1.1.1...1.0.1...0.1.1...0.1.1...0.1.1...0.0.1...0.0.1

------

...1.0.0...1.0.0...1.0.0...1.0.0...1.1.0...1.1.0...1.1.1...0.0.1...0.1.1

...1.1.0...1.1.1...1.0.0...1.0.1...1.0.0...1.0.1...1.0.0...1.0.1...1.0.1

...0.1.1...0.0.1...1.1.1...1.1.1...1.1.1...1.1.1...1.1.1...1.1.1...1.1.1

------

...1.0.1

...1.0.1

...1.1.1

CROSSREFS

Sequence in context: A306181 A116977 A238981 * A062796 A347399 A353009

Adjacent sequences: A163691 A163692 A163693 * A163695 A163696 A163697

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 03 2009

STATUS

approved

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Last modified December 8 21:28 EST 2022. Contains 358698 sequences. (Running on oeis4.)