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!)
A192766 Number of n X n symmetric 0..3 arrays with each element equal to at least one horizontal or vertical neighbor, containing at least one 3 and with new values 0..3 introduced in lower triangular row major order 0
0, 0, 0, 17, 7720, 4829792, 6716752296, 25512182673851, 280268522844817397, 9139496699518220983774, 891049711767000782484301987 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for 5X5

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

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

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

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

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

CROSSREFS

Sequence in context: A287038 A198406 A198533 * A166326 A203678 A257044

Adjacent sequences:  A192763 A192764 A192765 * A192767 A192768 A192769

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 09 2011

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 July 26 10:35 EDT 2021. Contains 346294 sequences. (Running on oeis4.)