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A146717 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-1111-1000 pattern in any orientation. 0
1, 1, 1, 1, 1, 5, 17, 39, 155, 745, 4705, 39573, 369483, 3970963, 54943873, 950039207, 20417177215, 545483266919, 17663079620537, 695250063366563, 33778790635375371 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.1.0.0

.0.0.0.1.1.0.1.0

.0.0.0.0.1.0.1.0

.1.1.0.0.1.0.1.1

.1.1.1.1.0.1.1.1

.1.0.0.0.1.0.0.0

.0.1.1.1.1.0.0.0

.0.0.0.1.1.0.0.0

CROSSREFS

Sequence in context: A147165 A147257 A146645 * A147467 A146272 A147035

Adjacent sequences:  A146714 A146715 A146716 * A146718 A146719 A146720

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified June 28 10:20 EDT 2022. Contains 354903 sequences. (Running on oeis4.)