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A146904 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0010-1110-0111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 7, 13, 27, 81, 287, 1153, 4961, 23911, 134777, 885445, 6659249, 57412261, 568445509, 6410206283, 82425528579, 1216468689493, 20669872378163, 403437418129203, 9012600422728359, 230172718811608655, 6730737235950056465 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..28.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.1.0

.0.0.0.0.1.1.1.0

.0.0.0.0.0.1.1.1

.0.0.1.0.0.1.0.0

.0.0.1.1.1.0.0.0

.0.1.1.1.0.0.0.0

.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A080241 A098479 A119445 * A146432 A258349 A089726

Adjacent sequences:  A146901 A146902 A146903 * A146905 A146906 A146907

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified June 24 10:10 EDT 2019. Contains 324323 sequences. (Running on oeis4.)