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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A226404 Number of nondecreasing -n..n vectors of length 7 whose dot product with some nonincreasing -n..n vector equals 7 0
2, 92, 1012, 4280, 15614, 41428, 109062, 228130, 457746, 838870, 1503000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 7 of A226398

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for n=3

..0....0...-3...-3...-3...-3...-3...-3...-1...-2...-3...-3...-3...-1...-3...-3

..0....0....2...-2...-3...-2...-2...-1...-1...-1...-2...-3...-3....2...-3...-3

..0....0....3...-2...-3...-2...-1...-1...-1....1...-2...-3...-2....2...-3...-2

..1....2....3...-2...-2...-1....0...-1....0....2...-2...-2...-2....2...-3...-1

..2....2....3...-1....0...-1....0....0....3....2...-2...-2...-1....2...-1....1

..3....2....3....0....1....0....1....0....3....3...-1....1....3....3...-1....1

..3....3....3....0....3....3....1....2....3....3....0....3....3....3....1....1

CROSSREFS

Sequence in context: A116293 A030985 A053313 * A166825 A042057 A214542

Adjacent sequences:  A226401 A226402 A226403 * A226405 A226406 A226407

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 06 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 16 09:06 EST 2019. Contains 330020 sequences. (Running on oeis4.)