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A147285 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0111-0001-0001 pattern in any orientation. 0
1, 1, 1, 1, 3, 7, 15, 31, 117, 707, 4175, 24315, 175637 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.1.1.0

.0.0.0.0.0.0.1.0

.0.0.0.0.0.0.1.1

.0.0.0.0.0.0.0.1

.1.0.0.0.0.0.0.0

.1.0.0.0.0.0.0.0

.1.1.1.0.0.0.0.0

.0.0.1.1.0.0.0.0

CROSSREFS

Sequence in context: A146598 A147094 A326518 * A147250 A336701 A066175

Adjacent sequences: A147282 A147283 A147284 * A147286 A147287 A147288

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified March 21 14:15 EDT 2023. Contains 361408 sequences. (Running on oeis4.)