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A146866 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1101-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 9, 25, 67, 375, 1415, 11011, 122823, 1158135, 14699219, 232067021, 4207284521, 106772232239, 3295265497287, 118967291277627, 5362038267435757, 294471642312195023, 20044933173937086949 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.1.0.1.0.0

.0.0.1.1.1.1.0.0

.1.1.0.0.0.0.1.1

.1.1.0.0.0.0.0.1

.0.1.0.0.0.0.1.1

.1.1.0.0.0.0.1.1

.0.0.1.0.1.1.0.0

.0.0.1.1.1.1.0.0

CROSSREFS

Sequence in context: A147392 A147318 A146589 * A271731 A126363 A036836

Adjacent sequences:  A146863 A146864 A146865 * A146867 A146868 A146869

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified May 30 15:43 EDT 2020. Contains 334726 sequences. (Running on oeis4.)