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A146848 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-1111-0001 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 17, 21, 589, 1209, 14169, 35833, 752335, 2255937, 153849079, 571403355, 75555523219, 350876915239, 81358170973501, 466475370757593, 166717546455270435, 1170203411896641439 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.1.1.0.0.1.1.0

.0.1.0.0.0.0.1.0

.1.1.0.0.0.0.1.1

.1.1.0.0.0.0.1.1

CROSSREFS

Sequence in context: A146707 A146643 A146715 * A146611 A146398 A146406

Adjacent sequences:  A146845 A146846 A146847 * A146849 A146850 A146851

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 18 08:58 EDT 2021. Contains 348067 sequences. (Running on oeis4.)