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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

Table of n, a(n) for n=1..29.

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 A192161

Adjacent sequences:  A146251 A146252 A146253 * A146255 A146256 A146257

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified September 29 12:57 EDT 2022. Contains 357090 sequences. (Running on oeis4.)