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A146255 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 110-111-011 pattern in any orientation. 0
1, 1, 3, 1, 5, 9, 27, 79, 359, 979, 7545, 28031, 289781, 1662565, 22704081, 184816617, 3459666973, 37715425193, 1006494628185, 14994761556409, 556041103278131, 11700677821513253 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.1.1.0

.0.0.0.0.1.1.1.0

.0.1.1.0.1.1.0.0

.1.1.1.0.0.0.1.1

.1.1.0.0.0.1.1.1

.0.0.1.1.0.1.1.0

.0.1.1.1.0.0.0.0

.0.1.1.0.0.0.0.0

CROSSREFS

Sequence in context: A202504 A055199 A146916 * A331432 A122366 A228781

Adjacent sequences:  A146252 A146253 A146254 * A146256 A146257 A146258

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified February 20 13:40 EST 2020. Contains 332077 sequences. (Running on oeis4.)