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

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A193811 Number of nXn symmetric 0..6 arrays with no element equal to the difference mod 7 of any two of its horizontal and vertical neighbors 0
7, 186, 8064, 722340, 150684732, 82103110920, 123085880400552, 516200827188869448 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for 4X4

..1..0..0..4....2..0..4..6....3..3..4..5....3..3..1..3....4..0..2..4

..0..2..1..0....0..6..0..0....3..2..4..4....3..1..1..3....0..1..3..0

..0..1..4..0....4..0..3..2....4..4..4..3....1..1..3..1....2..3..2..6

..4..0..0..5....6..0..2..3....5..4..3..5....3..3..1..1....4..0..6..5

CROSSREFS

Sequence in context: A176338 A012843 A012798 * A219567 A202791 A010332

Adjacent sequences:  A193808 A193809 A193810 * A193812 A193813 A193814

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 05 2011

STATUS

approved

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

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

Last modified November 27 04:47 EST 2014. Contains 250155 sequences.