login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A266319 Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its west or north neighbor modulo 3 and the upper left element equal to 0. 2
1, 2, 8, 30, 114, 414, 1561, 6227, 25712, 107071, 445688, 1860037, 7822241, 33194789, 141813340, 608193866, 2615140082, 11275208902, 48764348038, 211550067336, 920159818053, 4010884160844, 17515357388423, 76622591861147 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 3 of A266318.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..100

EXAMPLE

Some solutions for n=4

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

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

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

CROSSREFS

Cf. A266318.

Sequence in context: A281949 A162551 A073663 * A155116 A133915 A150759

Adjacent sequences:  A266316 A266317 A266318 * A266320 A266321 A266322

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 27 2015

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 March 20 09:50 EDT 2019. Contains 321345 sequences. (Running on oeis4.)