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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
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 * A329708 A263493 A166237
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 09 2009
STATUS
approved

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Last modified March 29 04:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)