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A146710 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-1111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 33, 61, 193, 825, 3483, 14075, 51829, 241741, 1419559, 10170199, 74039549, 568610375, 4513545321 (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

.0.1.0.0.1.0.1.1

.0.1.0.0.0.1.1.1

.1.1.1.0.0.0.1.0

.1.1.0.1.0.0.1.0

.0.0.1.1.1.1.0.0

.0.0.1.1.0.0.0.0

CROSSREFS

Sequence in context: A147135 A146843 A146630 * A146803 A146702 A146734

Adjacent sequences:  A146707 A146708 A146709 * A146711 A146712 A146713

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 22 11:47 EDT 2021. Contains 348168 sequences. (Running on oeis4.)