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A147339 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0100-0100-1111-0010-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 11, 15, 183, 305, 1851, 3761, 35145, 75363, 1670651, 4265463, 180681913, 541465905, 30900571055, 107421245147, 8457236647761, 34044967457309, 4310491231691799 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0.0

.0.0.1.0.0.0.1.0.0

.0.0.1.0.0.0.1.0.0

.1.1.1.1.0.1.1.1.1

.0.1.0.0.0.0.0.1.0

.0.1.0.0.0.0.0.1.0

CROSSREFS

Sequence in context: A217085 A267123 A115779 * A147377 A147333 A097156

Adjacent sequences:  A147336 A147337 A147338 * A147340 A147341 A147342

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified October 25 20:21 EDT 2021. Contains 348256 sequences. (Running on oeis4.)