login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A146635 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1010-1111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 17, 21, 573, 1143, 12157, 30947, 815741, 2476195, 202594803, 779485843, 111542186257, 533921262483, 123308337464907, 729814403884893, 315429715621991523, 2305738249128638897 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.1.0.0.0.0.1.0

.1.1.0.0.0.0.1.1

.0.1.1.0.0.1.1.0

.1.1.0.0.0.0.1.1

CROSSREFS

Sequence in context: A147163 A147179 A146627 * A146832 A146699 A146707

Adjacent sequences:  A146632 A146633 A146634 * A146636 A146637 A146638

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 22 14:40 EDT 2021. Contains 348170 sequences. (Running on oeis4.)