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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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Aug 03 2009
STATUS
approved

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Last modified July 18 01:34 EDT 2024. Contains 374377 sequences. (Running on oeis4.)