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A146653 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0100-1111 pattern in any orientation. 0
1, 1, 1, 1, 3, 7, 19, 43, 173, 1027, 6241, 39873, 317065, 3440337, 46130903, 694355761, 12449375951, 281232131103, 7909400224367, 265990951612641 (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

.0.1.1.1.1.0.0.0

.1.0.0.1.0.0.0.0

.1.0.0.1.1.0.0.0

.1.1.1.0.0.1.0.1

.1.0.1.0.0.1.1.1

.0.0.0.1.1.0.0.1

.0.0.0.0.1.0.0.1

.0.0.0.1.1.1.1.0

CROSSREFS

Sequence in context: A334099 A136041 A146685 * A096447 A274596 A185696

Adjacent sequences:  A146650 A146651 A146652 * A146654 A146655 A146656

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified May 31 16:29 EDT 2020. Contains 334748 sequences. (Running on oeis4.)