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A146858 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1101-0111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 5, 17, 43, 153, 711, 4787, 36997, 323223, 3456487, 47029493, 778875019, 15666901145, 390119856899, 11978383979491, 447614381910255, 20341843546977767 (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

.0.0.1.0.1.1.0.0

.0.0.1.1.1.0.0.0

.1.1.0.0.1.0.0.1

.0.1.0.0.0.1.1.1

.1.1.1.0.0.0.1.0

.1.0.0.1.0.0.1.1

.0.0.0.1.1.1.0.0

.0.0.1.1.0.1.0.0

CROSSREFS

Sequence in context: A046916 A089527 A146778 * A146183 A163424 A294102

Adjacent sequences:  A146855 A146856 A146857 * A146859 A146860 A146861

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified October 5 08:29 EDT 2022. Contains 357252 sequences. (Running on oeis4.)