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!)
A147017 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 01000-11111-00010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 3, 15, 21, 45, 77, 277, 567, 2577, 6557, 31507, 89591, 535509, 1822317, 13376361, 54721945, 461666973, 2203494951, 22033823051 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

Maximal 8 X 8 example

.0.1.0.0.0.0.1.0

.1.1.0.1.1.1.1.1

.0.1.0.0.1.0.0.0

.0.1.1.0.0.0.1.0

.0.1.0.0.0.1.1.0

.0.0.0.1.0.0.1.0

.1.1.1.1.1.0.1.1

.0.1.0.0.0.0.1.0

CROSSREFS

Sequence in context: A261274 A014493 A147025 * A171570 A076825 A259745

Adjacent sequences:  A147014 A147015 A147016 * A147018 A147019 A147020

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 01:48 EDT 2021. Contains 348160 sequences. (Running on oeis4.)