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A146813 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1010-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 17, 37, 69, 167, 487, 1595, 5107, 22241, 105661, 549863, 3071095, 17729121, 112871021, 819713685 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.1.1.0

.1.0.0.1.0.1.0.0

.1.1.0.1.0.0.0.0

.1.0.0.0.0.1.1.1

.1.1.1.0.0.0.0.1

.0.0.0.0.1.0.1.1

.0.0.1.0.1.0.0.1

.0.1.1.1.1.0.0.0

CROSSREFS

Sequence in context: A031290 A152908 A031386 * A106895 A106896 A097938

Adjacent sequences:  A146810 A146811 A146812 * A146814 A146815 A146816

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified August 11 10:15 EDT 2022. Contains 356065 sequences. (Running on oeis4.)