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A147279 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1100-0111-0001 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 9, 17, 33, 105, 379, 919, 2871, 9565, 62893, 248053, 1633141, 8782131, 72370235 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,10

LINKS

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

EXAMPLE

Maximal 10 X 10 example

.0.0.0.0.0.0.1.1.0.0

.0.0.0.0.0.0.1.0.0.0

.0.0.0.0.0.1.1.0.0.1

.0.0.0.0.1.1.0.1.1.1

.0.0.0.1.0.0.1.1.0.0

.0.0.1.1.0.0.1.0.0.0

.1.1.1.0.1.1.0.0.0.0

.1.0.0.1.1.0.0.0.0.0

.0.0.0.1.0.0.0.0.0.0

.0.0.1.1.0.0.0.0.0.0

CROSSREFS

Sequence in context: A262453 A197344 A146236 * A173788 A097478 A147026

Adjacent sequences:  A147276 A147277 A147278 * A147280 A147281 A147282

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified January 27 09:20 EST 2022. Contains 350607 sequences. (Running on oeis4.)