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A146696 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1100-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 15, 39, 69, 161, 595, 1935, 6509, 28979, 154855, 881531, 5028621, 31192755, 226496585, 1775509113 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.1.0.0.0.0.1.1.1

.1.0.0.0.1.1.0.0

.1.1.1.0.1.1.0.0

.0.1.1.0.0.0.0.0

.0.0.0.0.0.1.1.0

.0.0.1.1.0.1.1.1

.0.0.1.1.0.0.0.1

.1.1.1.0.0.0.0.1

CROSSREFS

Sequence in context: A121051 A139042 A020142 * A186295 A259429 A126950

Adjacent sequences:  A146693 A146694 A146695 * A146697 A146698 A146699

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified November 28 13:47 EST 2021. Contains 349413 sequences. (Running on oeis4.)