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!)
A156380 Number of 3X3 arrays of squares of integers, symmetric about main diagonal, with all rows summing to n. 0
1, 4, 4, 1, 4, 6, 4, 0, 4, 8, 6, 4, 1, 6, 6, 0, 4, 10, 8, 4, 6, 6, 4, 0, 4, 16, 12, 5, 0, 12, 6, 0, 4, 8, 16, 6, 8, 6, 10, 0, 6, 22, 6, 4, 4, 12, 6, 0, 1, 10, 22, 11, 6, 12, 14, 0, 6, 8, 6, 10, 0, 12, 12, 0, 4, 18, 20, 4, 10, 12, 6, 0, 8, 10, 18, 13, 4, 12, 6, 0, 6, 24, 10, 10, 6, 12, 16, 0, 4, 28, 18, 6 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..91.

EXAMPLE

All solutions for n=9

...0.0.9...0.9.0...1.4.4...1.4.4...4.1.4...4.4.1...9.0.0...9.0.0

...0.9.0...9.0.0...4.1.4...4.4.1...1.4.4...4.1.4...0.0.9...0.9.0

...9.0.0...0.0.9...4.4.1...4.1.4...4.4.1...1.4.4...0.9.0...0.0.9

CROSSREFS

Sequence in context: A327855 A213056 A135012 * A263493 A166237 A021878

Adjacent sequences:  A156377 A156378 A156379 * A156381 A156382 A156383

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 09 2009

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 01:43 EST 2019. Contains 330013 sequences. (Running on oeis4.)