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A146919 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0110-1111-0110 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 4, 8, 13, 37, 82, 203, 410, 1390, 3260, 13938, 41809, 202082, 670860, 3891211 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,8
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.0.1.1.0.0.0
.0.0.1.1.1.1.0.0
.0.1.0.1.1.0.1.0
.1.1.1.0.0.1.1.1
.1.1.1.0.0.1.1.1
.0.1.0.1.1.0.1.0
.0.0.1.1.1.1.0.0
.0.0.0.1.1.0.0.0
CROSSREFS
Sequence in context: A033016 A027008 A114997 * A312221 A312222 A312223
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved

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Last modified April 18 15:16 EDT 2024. Contains 371780 sequences. (Running on oeis4.)