login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A146066 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 5-point zee 1,1 2,1 2,2 2,3 3,3 in any orientation. 0
1, 1, 1, 1, 3, 9, 19, 69, 389, 2287, 15081, 141721, 1694175, 23795099, 418616469, 9434924199, 264113682081, 9153093458787, 397472720900369, 21616544571284115, 1466493314737915869, 124160358455186794957 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.1.1.0.1.1.0

.0.0.0.1.0.0.1.0

.1.0.0.1.1.0.1.1

.1.1.1.0.0.1.0.0

.0.0.1.0.0.1.1.1

.1.0.0.1.1.0.0.1

.1.1.1.0.1.0.0.0

.0.0.1.0.1.1.0.0

CROSSREFS

Sequence in context: A147070 A130586 A147146 * A164283 A178963 A033315

Adjacent sequences:  A146063 A146064 A146065 * A146067 A146068 A146069

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 26 2008

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 21 14:18 EST 2019. Contains 329371 sequences. (Running on oeis4.)