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A146177 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-100-111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 13, 33, 61, 115, 431, 1359, 5125, 23279, 156491, 866819, 5189807, 30665629, 248556857, 1970821419, 20754531695, 214278299237 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,7
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.0.1.0
.1.1.1.0.1.0.1.0
.0.0.1.0.1.1.1.0
.0.1.1.0.0.0.0.0
.0.0.0.0.0.1.1.0
.0.1.1.1.0.1.0.0
.0.1.0.1.0.1.1.1
.0.1.0.0.0.0.0.0
CROSSREFS
Sequence in context: A146052 A082109 A024839 * A146194 A204707 A282686
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 27 2008
STATUS
approved

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Last modified February 20 17:43 EST 2024. Contains 370215 sequences. (Running on oeis4.)