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A146173 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 110-100-111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 9, 9, 33, 33, 89, 89, 853, 853, 34557, 34557, 906369, 906369, 18920177, 18920177, 1254520087, 1254520087, 193995577775, 193995577775 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,7
LINKS
EXAMPLE
Maximal 8 X 8 example
.1.0.0.0.0.0.0.1
.1.0.1.0.0.1.0.1
.1.1.1.0.0.1.1.1
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.1.1.1.0.0.1.1.1
.1.0.1.0.0.1.0.1
.1.0.0.0.0.0.0.1
CROSSREFS
Sequence in context: A146825 A147029 A146258 * A146190 A147125 A147109
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 27 2008
STATUS
approved

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Last modified March 4 05:23 EST 2024. Contains 370522 sequences. (Running on oeis4.)