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A147432 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1010-1111-0101 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 3, 7, 13, 21, 39, 91, 251, 693, 2197, 6837, 23871, 89603, 379705, 1672695, 8302957, 42265243, 244734851, 1469763313 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..26.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.1.0.1.0.0

.0.0.0.1.1.1.1.0.0

.0.0.0.1.0.1.0.1.1

.0.1.1.0.0.0.1.1.0

.1.1.0.0.0.0.0.1.1

.0.1.1.0.0.0.1.1.0

.1.1.0.1.0.1.0.0.0

.0.0.1.1.1.1.0.0.0

.0.0.1.0.1.0.0.0.0

CROSSREFS

Sequence in context: A138035 A032606 A098482 * A018367 A146369 A146377

Adjacent sequences:  A147429 A147430 A147431 * A147433 A147434 A147435

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified April 17 14:34 EDT 2014. Contains 240646 sequences.