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A147213 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0111-0011 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 39, 117, 361, 955, 3303, 16663, 85069, 434621, 2513479, 17082851, 120871405, 925679621 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.1.1.0

.0.0.0.1.1.1.0.1

.0.0.0.1.1.0.1.1

.0.1.1.0.0.1.1.0

.0.1.1.0.0.1.1.0

.1.1.0.1.1.0.0.0

.1.0.1.1.1.0.0.0

.0.1.1.0.0.0.0.0

CROSSREFS

Sequence in context: A038163 A327381 A146819 * A146441 A147341 A208972

Adjacent sequences:  A147210 A147211 A147212 * A147214 A147215 A147216

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified July 6 05:39 EDT 2022. Contains 355108 sequences. (Running on oeis4.)