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A147030 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0100-0100-1111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 3, 13, 31, 77, 387, 2257, 17627, 156913, 1449769, 17078273, 269362403, 5270658519, 128747962057, 3752690933565, 128409913359645, 5451255918471683 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,6
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.1.0
.0.0.0.0.1.1.1.0
.0.0.0.1.0.0.1.1
.0.0.0.1.0.0.1.0
.0.0.1.1.1.1.0.0
.0.0.0.0.1.0.0.0
CROSSREFS
Sequence in context: A067980 A164569 A007686 * A146259 A146174 A147134
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved

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Last modified April 22 04:43 EDT 2024. Contains 371887 sequences. (Running on oeis4.)