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A156383 Number of 4X4 arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to n. 0
1, 6, 10, 6, 7, 22, 22, 6, 10, 28, 32, 22, 12, 28, 48, 22, 7, 44, 54, 28, 32, 54, 44, 22, 22, 58, 96, 58, 18, 86, 112, 28, 10, 74, 92, 86, 51, 50, 108, 54, 32, 108, 130, 58, 44, 130, 96, 44, 12, 82, 174, 116, 54, 92, 186, 74, 48, 106, 102, 116, 74, 114, 160, 106, 7, 164, 224, 88 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..67.

EXAMPLE

All solutions for n=4

...0.0.0.4...0.0.0.4...0.0.4.0...0.4.0.0...1.1.1.1...4.0.0.0...4.0.0.0

...0.0.4.0...0.4.0.0...0.0.0.4...4.0.0.0...1.1.1.1...0.0.4.0...0.4.0.0

...0.4.0.0...0.0.4.0...4.0.0.0...0.0.0.4...1.1.1.1...0.4.0.0...0.0.4.0

...4.0.0.0...4.0.0.0...0.4.0.0...0.0.4.0...1.1.1.1...0.0.0.4...0.0.0.4

CROSSREFS

Sequence in context: A075368 A235117 A074288 * A247270 A010726 A084365

Adjacent sequences:  A156380 A156381 A156382 * A156384 A156385 A156386

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 09 2009

STATUS

approved

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Last modified January 18 16:27 EST 2020. Contains 331011 sequences. (Running on oeis4.)