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A146834 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1001-1111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 5, 17, 41, 159, 789, 4693, 37959, 362149, 3798435, 51198703, 878343647, 18110228679, 463058495339, 14563433819389, 553118211838649, 25843199757659397 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.0.0.1.0.0

.0.0.1.1.1.1.0.0

.1.1.0.1.0.0.1.1

.0.1.1.0.0.0.1.0

.0.1.0.0.0.1.1.0

.1.1.0.0.1.0.1.1

.0.0.1.1.1.1.0.0

.0.0.1.0.0.1.0.0

CROSSREFS

Sequence in context: A201599 A246636 A146794 * A130739 A147412 A273116

Adjacent sequences:  A146831 A146832 A146833 * A146835 A146836 A146837

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 27 18:16 EDT 2021. Contains 348287 sequences. (Running on oeis4.)