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A147028 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0100-0100-1111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 177, 345, 2505, 5729, 75825, 187849, 6215801, 19558129, 3054260057, 12287993577, 1988214768097, 9763619895845, 2194779047865427, 13072631855408245 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,9
LINKS
EXAMPLE
Maximal 9 X 9 example
.0.1.0.0.0.0.0.1.0
.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
.0.0.1.0.0.0.1.0.0
.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
CROSSREFS
Sequence in context: A188537 A169641 A255786 * A105988 A292185 A083620
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved

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Last modified May 27 14:41 EDT 2024. Contains 372861 sequences. (Running on oeis4.)