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!)
A207978 Number of n X 2 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any diagonal or antidiagonal neighbor (colorings ignoring permutations of colors). 1
2, 7, 67, 1080, 25287, 794545, 31858034, 1573857867, 93345011951, 6514819011216, 526593974392123, 48658721593531669, 5084549201524804642, 595348294459678745663, 77500341343460209843627 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A207981.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..40

EXAMPLE

Some solutions for n=4

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

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

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

..2..0....3..3....1..0....3..4....3..1....1..1....0..1....3..4....0..1....0..1

CROSSREFS

Cf. A207981.

Sequence in context: A133237 A099660 A341088 * A307246 A225156 A260968

Adjacent sequences:  A207975 A207976 A207977 * A207979 A207980 A207981

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 22 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 July 2 18:27 EDT 2022. Contains 355029 sequences. (Running on oeis4.)