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A146685 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-1000-1111 pattern in any orientation. 0
1, 1, 1, 1, 3, 7, 19, 43, 167, 933, 5533, 35651, 275619, 2803985, 35280241, 511587387, 8841277573, 187861018789, 4919632132323, 154644209783001 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.1.1.0

.0.0.0.1.0.0.0.0

.0.0.0.1.1.0.0.0

.1.1.1.0.0.1.1.1

.1.0.1.0.0.1.0.1

.1.0.0.1.1.0.0.1

.1.0.0.1.0.0.0.1

.0.0.0.1.1.1.1.0

CROSSREFS

Sequence in context: A075900 A176500 A136041 * A146653 A096447 A274596

Adjacent sequences:  A146682 A146683 A146684 * A146686 A146687 A146688

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified March 25 03:50 EDT 2019. Contains 321450 sequences. (Running on oeis4.)