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!)
A221317 Number of nonnegative integer arrays of length n summing to n without equal adjacent values modulo 4 1
1, 2, 7, 14, 28, 66, 168, 378, 866, 2128, 5065, 12000, 28866, 69652, 167994, 405058, 981305, 2381232, 5776411, 14040684, 34175851, 83246764, 202960219, 495273680, 1209625253, 2956269734, 7229756488, 17692733704, 43322486571, 106136686984 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A221321

LINKS

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

EXAMPLE

Some solutions for n=7

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

..3....0....3....2....2....1....1....0....1....1....1....5....0....0....2....2

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

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

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

..1....1....1....1....1....1....0....1....5....3....2....1....0....3....2....0

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

CROSSREFS

Sequence in context: A200084 A184704 A295963 * A005998 A122751 A152944

Adjacent sequences:  A221314 A221315 A221316 * A221318 A221319 A221320

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 10 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 August 11 00:32 EDT 2020. Contains 336403 sequences. (Running on oeis4.)