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!)
A205950 Number of (n+1) X 4 0..3 arrays with no 2 X 2 subblock having the same number of clockwise edge increases as its horizontal neighbors or the same number of counterclockwise edge increases as its vertical neighbors. 1
17920, 310912, 5550256, 101702648, 1912957100, 36783376600, 718097911212, 14168783055608, 281683319581364, 5628530205351848, 112878301213615480, 2269166138679395320, 45695383178079335324, 921207719717378895736 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A205954.

LINKS

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

EXAMPLE

Some solutions for n=4:

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

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

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

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

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

CROSSREFS

Sequence in context: A258957 A258950 A258949 * A205461 A345869 A345585

Adjacent sequences:  A205947 A205948 A205949 * A205951 A205952 A205953

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 02 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 3 02:59 EDT 2022. Contains 357230 sequences. (Running on oeis4.)