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!)
A221831 Number of 4Xn arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without 2-loops or left turns 1
0, 64, 2930, 115417, 4715043, 192788993, 7888216533, 322723834959, 13203608881221, 540203150208573, 22101534579211095, 904249026745794715, 36995912673327194833, 1513629078095632460534, 61927733346071816062294 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A221828

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..25

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A295714 A187623 A187631 * A282397 A297100 A221090

Adjacent sequences:  A221828 A221829 A221830 * A221832 A221833 A221834

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 26 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 October 16 15:22 EDT 2021. Contains 348042 sequences. (Running on oeis4.)