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A146377 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 3, 7, 13, 21, 39, 136, 493, 1722, 5497, 18675, 87521, 494306, 2893703, 17090719, 106149289, 783678982, 6830573137, 66084580709, 674363788779, 7402933526180, 90919163844646, 1283657951631942, 20222581811585561 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

Table of n, a(n) for n=1..30.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.0.0.0

.0.0.1.1.1.1.0.0

.0.1.0.0.1.0.1.0

.0.1.0.0.0.1.1.1

.1.1.1.0.0.0.1.0

.0.1.0.1.0.0.1.0

.0.0.1.1.1.1.0.0

.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A147432 A018367 A146369 * A147501 A147335 A147464

Adjacent sequences:  A146374 A146375 A146376 * A146378 A146379 A146380

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified October 16 15:31 EDT 2019. Contains 328101 sequences. (Running on oeis4.)