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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A193786 Number of n X n symmetric 0..7 arrays with no element equal to the sum or difference mod 8 of any two of its horizontal and vertical neighbors 0
8, 225, 12385, 2332419, 1850486123, 6771682819965, 107524741264745861, 7041765967963842788487 (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

..6..4..3..5....4..4..5..3....6..2..6..6....2..2..6..2....6..2..2..5

..4..4..5..3....4..4..5..4....2..6..5..2....2..2..6..2....2..2..6..2

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

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

CROSSREFS

Sequence in context: A214383 A220546 A189445 * A213799 A316809 A299655

Adjacent sequences:  A193783 A193784 A193785 * A193787 A193788 A193789

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 | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 21 21:46 EDT 2019. Contains 328315 sequences. (Running on oeis4.)