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A146416 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-1000 pattern in any orientation. 0
1, 1, 1, 1, 1, 3, 9, 21, 62, 243, 1174, 7129, 48787, 396149, 3872121, 46149825, 666105009, 11588188375, 240646188473, 5995766803300, 179504408659371, 6478981553440867, 281573700280824120, 14724253264482951366 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,6
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.0.1.1.1.0.0
.0.0.0.0.1.0.1.0
.0.0.0.0.1.0.1.0
.1.0.0.0.1.0.1.0
.1.1.1.1.0.1.1.1
.1.0.0.0.1.0.0.0
.0.1.1.1.1.0.0.0
.0.0.0.0.1.0.0.0
CROSSREFS
Sequence in context: A060578 A147078 A341704 * A260185 A307105 A239663
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified March 29 05:48 EDT 2024. Contains 371265 sequences. (Running on oeis4.)