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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A164759 Number of nXn 1..4 arrays with all 1s connected, all 2s connected, all 3s connected, all 4s connected, 1 in the upper left corner, 2 in the upper right corner, 3 in the lower left corner, 4 in the lower right corner, and with no element having more than 3 neighbors with the same value 0
1, 104, 6549, 492920, 63388030 (list; graph; refs; listen; history; internal format)
OFFSET

2,2

EXAMPLE

Some solutions for n=4

...1.1.2.2...1.4.4.2...1.1.3.2...1.1.2.2...1.1.2.2...1.1.2.2...1.1.1.2

...3.1.2.4...1.1.4.2...1.1.3.2...3.1.2.2...1.1.2.2...1.3.2.2...1.3.1.2

...3.3.2.4...1.3.4.2...3.3.3.2...3.1.2.4...1.4.4.2...3.3.3.4...3.3.1.2

...3.3.4.4...3.3.4.4...3.3.4.4...3.1.2.4...3.3.4.4...3.4.4.4...3.1.1.4

------

...1.2.2.2...1.4.4.2...1.2.2.2...1.2.2.2...1.1.2.2...1.2.2.2...1.1.2.2

...1.2.3.2...1.4.4.2...1.3.2.2...1.1.2.4...1.3.3.2...1.1.1.1...1.2.2.2

...3.3.3.3...3.4.4.2...3.3.2.2...1.3.4.4...1.3.3.3...3.1.1.4...1.2.4.4

...3.4.4.4...3.3.4.4...3.3.2.4...3.3.3.4...3.3.4.4...3.3.4.4...3.2.4.4

CROSSREFS

Sequence in context: A007267 A035811 A004393 * A206013 A187700 A015272

Adjacent sequences:  A164756 A164757 A164758 * A164760 A164761 A164762

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) Aug 24 2009

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 15 09:54 EST 2012. Contains 205763 sequences.