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.

1, 1, 1, 1, 1, 1, 1, 1, 1, 9, 17, 33, 105, 379, 919, 2871, 9565, 62893, 248053, 1633141, 8782131, 72370235

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