A146718 - OEIS

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A146718

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-1111-1000 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 7, 13, 27, 41, 107, 327, 1681, 5451, 24597, 80545, 454313, 2226033, 18080203, 106915629

(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

.0.0.0.0.0.1.0.0.0

.0.0.1.1.1.1.0.0.0

.0.1.0.0.1.1.0.0.0

.0.1.0.0.0.0.1.1.1

.0.1.1.0.0.0.1.1.0

.1.1.1.0.0.0.0.1.0

.0.0.0.1.1.0.0.1.0

.0.0.0.1.1.1.1.0.0

.0.0.0.1.0.0.0.0.0

CROSSREFS

Sequence in context: A337433 A067870 A147258 * A146646 A096194 A160889

Adjacent sequences: A146715 A146716 A146717 * A146719 A146720 A146721

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved