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A146742 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1110-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 7, 15, 27, 47, 131, 579, 2405, 9787, 35829, 162637, 924049, 6701259, 48977223, 381859081, 3048055139, 30000129347 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.1.0.0

.0.0.1.1.1.1.0.0

.0.1.0.0.0.0.1.1

.1.1.0.0.0.0.1.1

.1.1.0.0.0.0.1.1

.1.1.0.0.0.0.1.0

.0.0.1.1.1.1.0.0

.0.0.1.1.1.0.0.0

CROSSREFS

Sequence in context: A182836 A097080 A274008 * A146425 A147595 A147127

Adjacent sequences:  A146739 A146740 A146741 * A146743 A146744 A146745

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified July 9 18:08 EDT 2020. Contains 335545 sequences. (Running on oeis4.)