A156387 Number of 5X5 arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to n.

1, 2, 0, 0, 5, 3, 0, 0, 2, 4, 0, 0, 0, 4, 0, 0, 7, 4, 0, 0, 7, 0, 0, 0, 0, 8, 0, 0, 0, 10, 0, 0, 6, 0, 0, 0, 15, 6, 0, 0, 6, 6, 0, 0, 0, 11, 0, 0, 0, 6, 0, 0, 10, 14, 0, 0, 0, 0, 0, 0, 0, 10, 0, 0, 7, 12, 0, 0, 28, 0, 0, 0, 10, 6, 0, 0, 0, 6, 0, 0, 17, 12, 0, 0, 0, 16, 0, 0, 0, 14, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0

Offset

0,2

Links

Table of n, a(n) for n=0..99.

Example

All solutions for n=4
...0.0.0.4.0...0.4.0.0.0...1.0.1.1.1...1.1.0.1.1...1.1.1.0.1
...4.0.0.0.0...0.0.0.0.4...1.1.1.1.0...1.1.0.1.1...0.1.1.1.1
...0.0.4.0.0...0.0.4.0.0...1.1.0.1.1...0.0.4.0.0...1.1.0.1.1
...0.0.0.0.4...4.0.0.0.0...0.1.1.1.1...1.1.0.1.1...1.1.1.1.0
...0.4.0.0.0...0.0.0.4.0...1.1.1.0.1...1.1.0.1.1...1.0.1.1.1

Crossrefs

Sequence in context: A145430 A143160 A369730 * A370065 A324040 A340116

Adjacent sequences: A156384 A156385 A156386 * A156388 A156389 A156390

Keyword

nonn

Author

R. H. Hardin Feb 09 2009

Status

approved