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A163735 Number of nX4 binary arrays with all 1s connected, all corners 1, and no 1 having more than two 1s adjacent 0
1, 2, 9, 13, 29, 87, 299, 917, 2589, 7059, 19075, 51111, 135445, 355377, 925723, 2398807, 6190289, 15920685, 40835851, 104520403, 267077847 (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=4

...1.0.0.1...1.1.0.1...1.0.1.1...1.1.1.1...1.1.1.1...1.1.1.1...1.1.1.1

...1.0.0.1...1.0.0.1...1.0.0.1...1.0.0.1...0.0.0.1...1.0.0.1...0.0.0.1

...1.0.0.1...1.0.0.1...1.0.0.1...1.0.0.1...0.0.0.1...0.0.0.1...1.0.0.1

...1.1.1.1...1.1.1.1...1.1.1.1...1.1.1.1...1.1.1.1...1.1.1.1...1.1.1.1

------

...1.1.1.1...1.1.1.1...1.1.1.1...1.1.1.1...1.1.1.1...1.1.1.1

...1.0.0.0...1.0.0.0...1.0.0.1...1.0.0.1...1.0.0.1...1.0.0.1

...1.0.0.0...1.0.0.1...1.0.0.0...1.0.0.1...1.0.0.1...1.0.0.1

...1.1.1.1...1.1.1.1...1.1.1.1...1.0.0.1...1.0.1.1...1.1.0.1

CROSSREFS

Sequence in context: A115907 A063634 A178688 * A144472 A220249 A071343

Adjacent sequences:  A163732 A163733 A163734 * A163736 A163737 A163738

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 03 2009

STATUS

approved

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Last modified April 6 22:23 EDT 2020. Contains 333291 sequences. (Running on oeis4.)