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!)
A225996 Number of pairs of orthogonal (-4,5) vectors of length 9*n. 1
3024, 1596291840, 294038117867520, 68184361565718773760, 16084808323123050319970304, 3830251318099321155852479496192, 931823480133178593246564251905032192 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Row 10 of A225987.
LINKS
EXAMPLE
Some solutions for n=1
..5..5....5..5...-4..5...-4..5...-4..5...-4..5...-4.-4...-4..5...-4..5...-4..5
.-4..5....5..5...-4..5...-4.-4....5..5...-4..5...-4..5...-4.-4...-4.-4....5..5
.-4..5...-4..5....5..5....5.-4....5.-4....5..5...-4..5...-4.-4...-4.-4...-4..5
..5..5....5.-4....5..5...-4.-4....5..5...-4..5...-4.-4....5.-4...-4..5...-4..5
..5.-4....5..5....5.-4...-4..5....5..5...-4..5...-4.-4....5.-4....5.-4...-4..5
.-4..5...-4..5....5..5...-4..5....5.-4....5..5...-4..5...-4.-4...-4.-4....5..5
..5..5...-4..5....5..5...-4.-4....5.-4....5..5...-4.-4...-4.-4...-4.-4....5..5
.-4..5...-4..5....5.-4...-4.-4....5..5....5..5...-4.-4...-4.-4...-4.-4....5.-4
..5..5....5..5....5.-4...-4.-4...-4..5...-4..5....5.-4...-4..5....5.-4....5..5
CROSSREFS
Sequence in context: A255736 A231762 A034600 * A167044 A221249 A038544
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 22 2013
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 March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)