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A147007 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 00100-11111-00100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 2, 3, 6, 9, 14, 23, 57, 131, 385, 909, 2527, 6618, 23479 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

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

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.1.0.0.0.0

.0.0.1.1.1.1.1.0.0

.0.1.0.0.1.0.0.1.0

.0.1.0.0.0.0.0.1.0

.1.1.1.0.0.0.1.1.1

.0.1.0.0.0.0.0.1.0

.0.1.0.0.1.0.0.1.0

.0.0.1.1.1.1.1.0.0

.0.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A228364 A018060 A115856 * A146937 A032231 A200273

Adjacent sequences:  A147004 A147005 A147006 * A147008 A147009 A147010

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified September 29 09:23 EDT 2022. Contains 357088 sequences. (Running on oeis4.)