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A145789 Number of n X n binary arrays with all ones connected only either four adjacent vertically or four adjacent horizontally. 0
1, 1, 1, 15, 89, 904, 10469, 202299, 6253788, 295345323, 20297903190, 2062672356086, 313264131593508 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..13.

CROSSREFS

Sequence in context: A241433 A220150 A164541 * A010822 A316224 A022707

Adjacent sequences:  A145786 A145787 A145788 * A145790 A145791 A145792

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 19 2008

STATUS

approved

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Last modified September 20 21:03 EDT 2019. Contains 327247 sequences. (Running on oeis4.)