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A147218 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-0111-0101 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 17, 27, 575, 1091, 10073, 26275, 436817, 1241759, 99221321, 359430255, 57329770665, 261948614931, 43007975306403, 238557155162155, 61726897724737383 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.1.1.0.0.0.0.1.1

.0.1.0.0.0.0.1.0

.1.1.1.0.0.1.1.1

.0.0.1.0.0.1.0.0

.1.0.0.0.0.0.0.1

.1.1.1.0.0.1.1.1

.0.1.0.0.0.0.1.0

.0.1.1.0.0.1.1.0

CROSSREFS

Sequence in context: A171168 A147202 A146776 * A146856 A217409 A256361

Adjacent sequences:  A147215 A147216 A147217 * A147219 A147220 A147221

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified June 28 07:25 EDT 2022. Contains 354903 sequences. (Running on oeis4.)