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A146263 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 110-111-101 pattern in any orientation. 0
1, 1, 1, 1, 5, 33, 133, 785, 3005, 17673, 190185, 2271593, 28110409, 628123625, 14202428649, 408602739063, 12463530182045 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..17.

EXAMPLE

Maximal 8 X 8 example

.1.0.1.0.0.0.0.0

.1.1.1.0.0.1.1.0

.1.1.0.0.0.0.1.1

.0.0.0.0.0.1.1.1

.1.1.1.0.0.0.0.0

.1.1.0.0.0.0.1.1

.0.1.1.0.0.1.1.1

.0.0.0.0.0.1.0.1

CROSSREFS

Sequence in context: A050830 A211059 A292000 * A255943 A270222 A270279

Adjacent sequences:  A146260 A146261 A146262 * A146264 A146265 A146266

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified November 13 07:13 EST 2019. Contains 329085 sequences. (Running on oeis4.)