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A145857 Number of n X n binary arrays with all ones connected only in two by two blocks. 1
1, 2, 5, 12, 72, 513, 4531, 68662, 1429824, 40840428, 1747979822, 106711196102, 9237029528023, 1158315077977449, 208422835867809541, 53674442198900292691, 19878424340459715152560, 10569643478952360023168707 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
EXAMPLE
Maximal 7 X 7 example
.0.0.0.1.1.0.0
.1.1.0.1.1.0.0
.1.1.0.0.0.1.1
.0.0.1.1.0.1.1
.0.0.1.1.0.0.0
.1.1.0.0.0.1.1
.1.1.0.0.0.1.1
CROSSREFS
Sequence in context: A355991 A347598 A293023 * A264863 A197706 A205082
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 22 2008
STATUS
approved

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Last modified June 25 08:26 EDT 2024. Contains 373697 sequences. (Running on oeis4.)