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!)
A146441 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0100-0111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 3, 9, 19, 39, 119, 357, 921, 3063, 15421, 82217, 416323, 2370803, 16101191, 113312875, 843888839, 7373458463, 76576709025 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.1.1.1.0.0.0.0

.1.0.0.1.0.0.0.0

.1.0.0.1.1.0.0.0

.1.1.1.0.0.1.0.0

.0.0.1.0.0.1.1.1

.0.0.0.1.1.0.0.1

.0.0.0.0.1.0.0.1

.0.0.0.0.1.1.1.0

CROSSREFS

Sequence in context: A327381 A146819 A147213 * A147341 A208972 A307541

Adjacent sequences:  A146438 A146439 A146440 * A146442 A146443 A146444

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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 27 04:16 EDT 2022. Contains 354888 sequences. (Running on oeis4.)