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A156384 Number of 4X4 arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to n. +0
1
1, 2, 2, 2, 3, 2, 2, 2, 2, 4, 4, 2, 4, 4, 0, 2, 3, 4, 6, 4, 4, 2, 4, 2, 2, 6, 4, 6, 6, 2, 0, 4, 2, 6, 8, 2, 7, 6, 4, 2, 4, 4, 6, 6, 4, 6, 0, 4, 4, 6, 6, 4, 10, 4, 6, 6, 0, 6, 10, 4, 6, 6, 0, 6, 3, 4, 8, 8, 8, 4, 6, 2, 6, 10, 4, 6, 10, 4, 0, 4, 4, 8, 14, 6, 6, 8, 4, 6, 4, 6, 10, 6, 6, 6, 0, 2, 2, 12, 8, 8 (list; graph; listen)
OFFSET

0,2

EXAMPLE

All solutions for n=9

...0.0.9.0...0.9.0.0...4.0.1.4...4.1.0.4

...9.0.0.0...0.0.0.9...1.4.4.0...0.4.4.1

...0.0.0.9...9.0.0.0...0.4.4.1...1.4.4.0

...0.9.0.0...0.0.9.0...4.1.0.4...4.0.1.4

CROSSREFS

Sequence in context: A130192 A104564 A160764 this_sequence A064656 A056608 A091787

Adjacent sequences: A156381 A156382 A156383 this_sequence A156385 A156386 A156387

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net) Feb 09 2009

page 1

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.


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