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A146701 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-1111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 7, 21, 49, 229, 1181, 8807, 80469, 829699, 10398391, 167768019, 3412508539, 87515053777, 2785697640499, 108585173715039, 5239601524903617 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..20.

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

.0.1.1.0.1.1.1.1

.1.1.0.1.0.1.0.0

.1.1.0.1.1.0.0.0

.0.0.1.1.0.0.0.0

.0.0.1.1.0.0.0.0

CROSSREFS

Sequence in context: A163723 A146669 A146637 * A146613 A083012 A233329

Adjacent sequences:  A146698 A146699 A146700 * A146702 A146703 A146704

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 25 11:07 EDT 2021. Contains 348239 sequences. (Running on oeis4.)