login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A193118 Number of n X n symmetric 0..1 arrays with each element equal to the sum mod 2 of two of its horizontal and vertical neighbors 1
0, 1, 5, 39, 647, 21146, 1250105, 139314922, 29548707285, 11818077270598, 8900542771643288, 12649997383379784930, 33932210714032782401695, 171701849324595889268521428, 1639015389067019632170263988618 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
EXAMPLE
Some solutions for 4X4
..0..1..0..1....0..0..1..1....0..0..0..1....0..0..0..1....0..0..1..1
..1..1..0..1....0..1..1..0....0..1..1..1....0..0..0..1....0..0..1..0
..0..0..0..0....1..1..0..0....0..1..1..0....0..0..0..0....1..1..0..0
..1..1..0..0....1..0..0..0....1..1..0..0....1..1..0..0....1..0..0..0
CROSSREFS
Sequence in context: A322884 A352658 A221412 * A227636 A118991 A253920
KEYWORD
nonn
AUTHOR
R. H. Hardin Jul 16 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 23 09:34 EDT 2024. Contains 373629 sequences. (Running on oeis4.)