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A146282 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 111-110-111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 9, 5, 29, 17, 313, 37, 1657, 109, 19905, 2661, 319705, 46501, 11762329, 480069, 357135757, 5729689, 14191646903, 346242155, 884769592659, 24356919567 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,7
LINKS
EXAMPLE
Maximal 8 X 8 example
.1.0.1.0.0.1.0.1
.1.1.1.0.0.1.1.1
.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
.1.1.1.0.0.1.1.1
.1.0.1.0.0.1.0.1
CROSSREFS
Sequence in context: A298584 A238475 A180878 * A117911 A061041 A248308
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified February 27 04:33 EST 2024. Contains 370362 sequences. (Running on oeis4.)