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A146743 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 13, 29, 57, 123, 437, 1523, 7643, 32273, 153925, 786845, 5340469, 36899655, 318800081, 2591600741, 26626203639, 272703572385 (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

.0.0.0.1.1.1.1.0

.1.0.0.1.1.1.0.0

.1.1.0.0.0.0.0.0

.1.1.0.0.0.0.1.1

.1.1.0.0.0.0.1.1

.0.0.0.0.0.0.1.1

.0.0.1.1.1.0.0.1

.0.1.1.1.1.0.0.0

CROSSREFS

Sequence in context: A098062 A094481 A045637 * A065546 A075636 A139838

Adjacent sequences:  A146740 A146741 A146742 * A146744 A146745 A146746

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified December 5 05:27 EST 2016. Contains 278761 sequences.