A147166 - OEIS

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A147166

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1101-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 5, 13, 25, 47, 123, 369, 1165, 4187, 18445, 79415, 399577, 2091817, 12535539, 80500731

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,9

LINKS

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

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.0.1.0.0

.0.0.0.1.0.1.1.0.0

.0.0.0.1.1.1.0.1.1

.0.1.1.0.0.0.1.1.0

.0.0.1.0.0.0.1.0.0

.0.1.1.0.0.0.1.1.0

.1.1.0.1.1.1.0.0.0

.0.0.1.1.0.1.0.0.0

.0.0.1.0.0.0.0.0.0

CROSSREFS

Sequence in context: A146175 A146851 A146260 * A146192 A147265 A272705

Adjacent sequences: A147163 A147164 A147165 * A147167 A147168 A147169

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved