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A146803 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0110-1100-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 33, 63, 179, 631, 2615, 10639, 41433, 178083, 913809, 5548581, 37539533, 271244083 (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

.0.0.0.1.1.1.0.0

.0.0.1.1.0.0.0.0

.0.1.0.1.1.0.0.1

.1.1.1.0.0.1.0.1

.1.0.1.0.0.1.1.1

.1.0.0.1.1.0.1.0

.0.0.0.0.1.1.0.0

.0.0.1.1.1.0.0.0

CROSSREFS

Sequence in context: A146843 A146630 A146710 * A146702 A146734 A146614

Adjacent sequences:  A146800 A146801 A146802 * A146804 A146805 A146806

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified November 27 09:19 EST 2021. Contains 349365 sequences. (Running on oeis4.)