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A147078 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 10000-11111-10000 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 9, 21, 61, 210, 735, 3592, 21789, 146171, 1140039, 10204453, 104577719, 1275721875, 18485616051, 314997048326, 6290384717771, 146342301648076 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,7
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.1.1.0
.0.0.0.0.0.1.0.0
.0.0.0.0.0.1.0.0
.0.0.0.0.0.1.0.0
.1.0.0.0.0.1.0.0
.1.1.1.1.1.0.0.0
.1.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
CROSSREFS
Sequence in context: A026551 A296719 A060578 * A341704 A146416 A260185
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved

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Last modified March 28 05:39 EDT 2024. Contains 371235 sequences. (Running on oeis4.)