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A147015 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 01000-11111-00010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 3, 5, 11, 17, 29, 49, 193, 509, 1945, 5173, 19089, 57135, 304805, 1236463, 7710953, 34938029, 239632727, 1249524805, 10579289505, 68493745825 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..28.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.1.0.0.0

.0.0.1.1.1.1.1.0.0

.0.1.0.1.0.0.0.1.0

.0.1.1.0.0.0.0.1.1

.0.1.0.0.0.0.0.1.0

.1.1.0.0.0.0.1.1.0

.0.1.0.0.0.1.0.1.0

.0.0.1.1.1.1.1.0.0

.0.0.0.1.0.0.0.0.0

CROSSREFS

Sequence in context: A023218 A073022 A129694 * A147023 A108402 A090795

Adjacent sequences:  A147012 A147013 A147014 * A147016 A147017 A147018

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified November 22 05:19 EST 2014. Contains 249804 sequences.