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A146254 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-111-011 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 11, 15, 27, 47, 153, 311, 1151, 2849, 13187, 36901, 183137, 600651, 3599693, 14056563, 100844845, 464890609, 3938830471, 21240835037, 209440142193, 1329357548469, 15466899531131, 115875805461919 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,7
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.1.1.0
.1.1.0.0.1.1.1.0
.1.1.1.0.1.1.0.0
.0.1.1.0.0.0.0.0
.0.0.0.0.0.1.1.0
.0.0.1.1.0.1.1.1
.0.1.1.1.0.0.1.1
.0.1.1.0.0.0.0.0
CROSSREFS
Sequence in context: A323103 A046159 A022410 * A039503 A276971 A366813
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified June 18 14:56 EDT 2024. Contains 373481 sequences. (Running on oeis4.)