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A146590 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0110-1111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 5, 13, 25, 41, 73, 405, 2087, 9095, 31781, 109905, 706437, 6193961, 52066515, 395176419, 2801856537, 27230658787 (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

.0.0.0.0.1.0.0.0

.0.0.1.1.1.1.0.0

.0.1.0.1.1.0.1.0

.0.1.1.0.0.1.1.1

.1.1.1.0.0.1.1.0

.0.1.0.1.1.0.1.0

.0.0.1.1.1.1.0.0

.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A299258 A301671 A268525 * A098483 A147205 A146875

Adjacent sequences: A146587 A146588 A146589 * A146591 A146592 A146593

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified February 3 08:18 EST 2023. Contains 360034 sequences. (Running on oeis4.)