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

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A209854 1/4 the number of (n+1)X5 0..3 arrays with every 2X2 subblock having one or four distinct clockwise edge differences 1
9455, 661963, 45071990, 3111914707, 213959648565, 14741920546390, 1014683000461958, 69877891568505574, 4810912751472199040, 331268218089091178660, 22808554042049077880530, 1570485935577042648260737 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A209858

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=4

..1..1..3..3..0....0..2..2..1..2....3..2..2..3..1....3..2..0..1..0

..3..0..1..0..2....2..3..0..2..0....1..3..0..2..3....3..0..1..3..2

..1..1..3..0..3....3..1..1..3..0....2..1..1..3..0....2..2..3..2..0

..3..0..0..1..3....2..0..3..0..1....1..3..0..0..1....0..3..0..2..3

..1..3..2..0..1....2..3..1..3..1....3..0..1..3..0....1..0..1..3..0

CROSSREFS

Sequence in context: A035792 A252704 A202099 * A235734 A235515 A161726

Adjacent sequences:  A209851 A209852 A209853 * A209855 A209856 A209857

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 14 2012

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 December 1 02:46 EST 2021. Contains 349426 sequences. (Running on oeis4.)