A146192 - OEIS

A146192

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 101-111-100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 5, 13, 25, 47, 133, 423, 1611, 6775, 32933, 168271, 931101, 5598003, 40830563, 323824599, 3032262553, 30578017195, 362047227023

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OFFSET

1,8

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.0.1.0.0

.0.0.0.1.1.1.0.0

.0.0.0.1.0.0.1.1

.1.1.1.0.0.0.1.0

.0.1.0.0.0.1.1.1

.1.1.0.0.1.0.0.0

.0.0.1.1.1.0.0.0

.0.0.1.0.1.0.0.0

CROSSREFS

Sequence in context: A146851 A146260 A147166 * A147265 A272705 A147272

Adjacent sequences: A146189 A146190 A146191 * A146193 A146194 A146195

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 27 2008

STATUS

approved