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!)
A147229 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11011-01110 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 4, 9, 18, 29, 62, 159, 552, 1625, 6033, 18370, 76478, 293679, 1560810, 7445670, 46344151, 251751509, 1816985360, 11749000262 (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

.0.0.0.0.0.1.0.0

.0.1.1.1.0.1.1.0

.1.1.0.1.1.0.1.0

.0.0.1.0.0.1.1.0

.0.1.1.0.0.1.0.0

.0.1.0.1.1.0.1.1

.0.1.1.0.1.1.1.0

.0.0.1.0.0.0.0.0

CROSSREFS

Sequence in context: A301257 A036695 A301025 * A008149 A008025 A301196

Adjacent sequences:  A147226 A147227 A147228 * A147230 A147231 A147232

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 17 16:06 EDT 2021. Contains 348065 sequences. (Running on oeis4.)