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A147329 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 00100-00100-11111-00100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 2, 3, 8, 13, 22, 33, 80, 189, 739, 1949, 6380, 15828, 56294, 190233, 1028070, 4302870, 24217353, 101984675 (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

.0.0.0.0.1.0.0.0.0

.0.0.1.1.1.1.1.0.0

.0.1.0.0.1.0.0.1.0

.0.1.0.0.1.0.0.1.0

.1.1.1.1.0.1.1.1.1

.0.1.0.0.1.0.0.1.0

.0.1.0.0.1.0.0.1.0

.0.0.1.1.1.1.1.0.0

.0.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A002053 A102315 A142880 * A175148 A147417 A147357

Adjacent sequences:  A147326 A147327 A147328 * A147330 A147331 A147332

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified September 18 03:09 EDT 2021. Contains 347504 sequences. (Running on oeis4.)