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A147200 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0100-0111-0001 pattern in any orientation. 0
1, 1, 1, 1, 1, 5, 13, 45, 141, 593, 2479, 13149, 73679, 588757, 5000629, 56709831, 657094563 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..17.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.1.0.0.1.1

.0.0.1.0.0.0.1.0

.1.1.1.0.1.1.1.0

.1.0.0.0.1.0.0.0

.0.0.0.1.0.0.0.1

.0.1.1.1.0.1.1.1

.0.1.0.0.0.1.0.0

.1.1.0.0.1.1.0.0

CROSSREFS

Sequence in context: A006349 A322203 A052899 * A147396 A320877 A099972

Adjacent sequences:  A147197 A147198 A147199 * A147201 A147202 A147203

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified May 15 12:37 EDT 2021. Contains 343920 sequences. (Running on oeis4.)