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A147005 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 00100-11111-00100 pattern in any orientation. 0
1, 1, 1, 1, 3, 1, 5, 1, 8, 1, 60, 7, 328, 21, 2111, 77, 21687, 479, 274683, 3600, 4419391 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

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: A339236 A029669 A050329 * A254577 A051707 A302787

Adjacent sequences: A147002 A147003 A147004 * A147006 A147007 A147008

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified March 21 13:52 EDT 2023. Contains 361402 sequences. (Running on oeis4.)