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!)
A221486 Number of 4Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without consecutive moves in the same direction 1
0, 64, 313, 34751, 802711, 37622097, 1219698562, 47497298437, 1684060316110, 62602762212310, 2271866000217269, 83456368590958988, 3046870056535199883, 111585285541376641494, 4080105459850623520340, 149308509670479309110705 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A221483

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..23

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A299186 A299947 A251196 * A231942 A221686 A211258

Adjacent sequences:  A221483 A221484 A221485 * A221487 A221488 A221489

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 17 2013

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 September 25 08:41 EDT 2020. Contains 337335 sequences. (Running on oeis4.)