A156380 Number of 3X3 arrays of squares of integers, symmetric about main diagonal, with all rows summing to n.

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

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 * A329708 A263493 A166237

Adjacent sequences: A156377 A156378 A156379 * A156381 A156382 A156383

Keyword

nonn

Author

R. H. Hardin Feb 09 2009

Status

approved