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A147468 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-1111-0100-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 57, 101, 607, 1089, 8859, 19351, 240245, 590155, 24829301, 73370321, 4764846299, 16592732065, 1205158717385, 4890998445663, 529813293025221, 2499121025302115, 491892443613075873 (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

.0.0.1.1.0.1.1.0.0

.1.1.1.1.0.1.1.1.1

.0.0.1.0.0.0.1.0.0

.0.0.1.0.0.0.1.0.0

.0.0.0.0.0.0.0.0.0

.0.1.0.0.0.0.0.1.0

.0.1.0.0.0.0.0.1.0

.1.1.1.1.0.1.1.1.1

.1.1.0.0.0.0.0.1.1

CROSSREFS

Sequence in context: A200932 A145554 A111320 * A147036 A147044 A237663

Adjacent sequences:  A147465 A147466 A147467 * A147469 A147470 A147471

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified June 25 19:25 EDT 2022. Contains 354851 sequences. (Running on oeis4.)