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A146172 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 110-100-111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 117, 259, 1991, 4759, 52453, 136907, 6546215, 22604681, 6955049615, 33225401665, 5312086374693, 30690294218759, 6137053540967147, 42562920511505493, 35203573251917171119, 310505729227048458909 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,7
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.1.1.0.0.0.0.1.1
.1.0.0.0.0.0.0.1
.1.1.1.0.0.1.1.1
.0.0.0.0.0.0.0.0
.0.0.1.0.0.1.0.0
.1.0.1.0.0.1.0.1
.1.1.1.0.0.1.1.1
CROSSREFS
Sequence in context: A050245 A351574 A031174 * A146189 A063332 A063338
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 27 2008
STATUS
approved

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Last modified February 22 19:33 EST 2024. Contains 370260 sequences. (Running on oeis4.)