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A146819 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1110-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 39, 117, 351, 957, 3341, 15997, 83175, 424759, 2415699, 15982837, 113541201, 873618675 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.1.1.1.0.0.0.0

.1.0.1.1.1.0.0.0

.1.1.0.0.1.0.0.0

.1.1.0.0.0.1.1.0

.0.1.1.0.0.0.1.1

.0.0.0.1.0.0.1.1

.0.0.0.1.1.1.0.1

.0.0.0.0.1.1.1.0

CROSSREFS

Sequence in context: A135117 A038163 A327381 * A147213 A146441 A147341

Adjacent sequences:  A146816 A146817 A146818 * A146820 A146821 A146822

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified May 21 14:54 EDT 2022. Contains 353921 sequences. (Running on oeis4.)