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Search: id:A147218
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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, 1, 17, 27, 575, 1091, 10073, 26275, 436817, 1241759, 99221321, 359430255, 57329770665, 261948614931, 43007975306403, 238557155162155, 61726897724737383 (list; graph; listen)
OFFSET

1,7

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: A000797 A147202 A146776 this_sequence A146856 A134468 A032611

Adjacent sequences: A147215 A147216 A147217 this_sequence A147219 A147220 A147221

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net), Nov 04 2008

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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