login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A147006 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 00100-11111-00100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 7, 14, 39, 108, 339, 1512, 7447, 40037, 248431, 1729177, 13906995, 133020215, 1477709272, 18786585661, 273016606323, 4544925816863, 87252400485138, 1941478219409803, 49994513906410819, 1483543905376332107 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..27.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.1.0

.0.0.0.0.0.0.1.0

.0.0.0.0.0.1.1.1

.0.0.0.0.0.0.1.0

.0.0.0.1.0.0.1.0

.0.1.1.1.1.1.0.0

.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A231464 A146920 A079939 * A146936 A184264 A298913

Adjacent sequences: A147003 A147004 A147005 * A147007 A147008 A147009

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 30 23:40 EDT 2023. Contains 361623 sequences. (Running on oeis4.)