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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A147321 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 00100-00100-00100-11111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 7, 16, 39, 109, 339, 1359, 6341, 32204, 186717, 1250465, 9543435, 82560858, 815884422, 9279731421, 121699162939, 1834559945393, 31585819621707 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.1

.0.0.0.0.0.0.0.1

.0.0.0.0.1.1.1.1

.0.0.0.1.0.0.0.1

.0.0.0.1.0.0.0.1

.0.0.0.1.0.0.0.0

.0.1.1.1.1.1.0.0

CROSSREFS

Sequence in context: A014140 A271788 A103439 * A103030 A263316 A001698

Adjacent sequences:  A147318 A147319 A147320 * A147322 A147323 A147324

KEYWORD

nonn

AUTHOR

R. H. Hardin

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified February 20 14:53 EST 2018. Contains 299380 sequences. (Running on oeis4.)