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!)
A261284 Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00010101 or 01010101. 1
36, 77, 271, 1147, 6996, 51268, 561724, 6295926, 107865659, 2065840014, 57883274521, 1752577624054, 80161163488540, 3993898268151118, 295206710031036849, 23800415351857927140, 2870471520849798820514 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A261292.

LINKS

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

EXAMPLE

Some solutions for n=4

..1..0..0..0..1..0....1..0..1..0..1..0....0..0..0..0..1..0....1..0..1..0..1..0

..0..1..0..1..0..1....0..1..0..1..0..1....0..0..0..0..0..1....0..1..0..1..0..1

..1..0..1..0..1..0....1..0..0..0..1..0....0..0..1..0..1..0....1..0..1..0..1..0

..0..1..0..1..0..1....0..1..0..1..0..0....0..0..0..1..0..1....0..1..0..1..0..1

..1..0..1..0..1..0....1..0..1..0..1..0....1..0..1..0..1..0....1..0..1..0..1..0

..0..1..0..1..0..1....0..1..0..0..0..0....0..1..0..1..0..1....0..1..0..0..0..1

CROSSREFS

Cf. A261292.

Sequence in context: A262796 A255101 A255094 * A111163 A286430 A279901

Adjacent sequences:  A261281 A261282 A261283 * A261285 A261286 A261287

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 14 2015

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 19 15:03 EDT 2022. Contains 353834 sequences. (Running on oeis4.)