A147071 - OEIS

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A147071

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 10000-11111-00001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 5, 11, 17, 33, 69, 195, 461, 1581, 4385, 16401, 52739, 234041, 877033, 4605425, 20357297, 124937647

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,10

LINKS

Table of n, a(n) for n=1..26.

EXAMPLE

Maximal 10 X 10 example

.0.0.0.0.0.0.0.1.0.0

.0.0.0.1.1.1.1.1.0.0

.0.0.0.1.0.0.0.0.1.1

.0.1.1.0.0.0.0.0.1.0

.0.1.0.0.0.0.0.0.1.0

.0.1.0.0.0.0.0.1.1.0

.1.1.0.0.0.0.1.0.0.0

.0.0.1.1.1.1.1.0.0.0

.0.0.1.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A091610 A327044 A006170 * A006171 A261674 A319632

Adjacent sequences: A147068 A147069 A147070 * A147072 A147073 A147074

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved