login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A206894 Number of n X n 0..3 arrays avoiding the pattern z-2 z-1 z in any row, column or nw-to-se diagonal 0
4, 256, 211548, 2408811358, 369048436354154, 768965608329861602588, 21727183867324671091396681434 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A206900

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A207128 A223579 A206832 * A207284 A229100 A060757

Adjacent sequences:  A206891 A206892 A206893 * A206895 A206896 A206897

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 13 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 6 13:45 EST 2021. Contains 349563 sequences. (Running on oeis4.)