The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
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!)
A147038 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0100-0100-1111-0100 pattern in any orientation. 0
1, 1, 1, 3, 5, 9, 21, 69, 305, 1333, 6087, 37147, 280959, 2501123, 26363255, 322801403, 4679667007, 81403804671, 1686900283495, 41922642406637, 1239283752468159, 43217375654523227, 1785265760870915049, 87797244145177135687 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,4
LINKS
EXAMPLE
Maximal 8 X 8 example
.0.0.1.0.0.0.1.0
.0.0.1.0.1.1.1.1
.1.1.1.1.0.0.1.0
.0.0.1.0.0.0.1.0
.0.1.0.0.0.1.0.0
.0.1.0.0.1.1.1.1
.1.1.1.1.0.1.0.0
.0.1.0.0.0.1.0.0
CROSSREFS
Sequence in context: A129787 A328525 A125517 * A146275 A089636 A241398
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 May 22 20:45 EDT 2024. Contains 372758 sequences. (Running on oeis4.)