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A163706 Number of nX4 binary arrays with all 1s connected, a path of 1s from left column to lower right corner, and no 1 having more than two 1s adjacent 0
1, 11, 63, 259, 896, 2821, 8515, 24940, 70944, 196626, 534162, 1430008, 3786133, 9937397, 25902833, 67151065, 173338487, 445930356, 1144130515, 2929289696, 7487194973 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

All solutions for n=2

...0.0.0.0...0.0.0.1...1.0.0.0...1.0.0.1...1.1.0.0...1.1.0.1...1.1.1.0

...1.1.1.1...1.1.1.1...1.1.1.1...1.1.1.1...0.1.1.1...0.1.1.1...0.0.1.1

------

...1.1.1.0...1.1.1.1...1.1.1.1...0.1.1.1

...1.0.1.1...0.0.0.1...1.0.0.1...1.1.0.1

CROSSREFS

Sequence in context: A298046 A120723 A053367 * A180763 A285361 A237358

Adjacent sequences:  A163703 A163704 A163705 * A163707 A163708 A163709

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 03 2009

STATUS

approved

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Last modified July 24 02:56 EDT 2019. Contains 325290 sequences. (Running on oeis4.)