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A146702 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-1111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 33, 65, 197, 769, 3257, 13441, 53529, 253559, 1417627, 9502081, 68675873, 543081895, 4543747499 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

Table of n, a(n) for n=1..23.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.1.0.0

.0.0.1.1.1.1.0.0

.0.1.0.1.0.0.1.1

.0.1.1.0.0.0.1.1

.1.1.0.0.0.1.1.0

.1.1.0.0.1.0.1.0

.0.0.1.1.1.1.0.0

.0.0.1.1.0.0.0.0

CROSSREFS

Sequence in context: A146630 A146710 A146803 * A146734 A146614 A146670

Adjacent sequences:  A146699 A146700 A146701 * A146703 A146704 A146705

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 22 13:49 EDT 2021. Contains 348170 sequences. (Running on oeis4.)