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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

Table of n, a(n) for n=1..23.

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 * A146416 A260185 A307105

Adjacent sequences:  A147075 A147076 A147077 * A147079 A147080 A147081

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified September 30 23:44 EDT 2020. Contains 337440 sequences. (Running on oeis4.)