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A156488 Number of n X n arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to 28. 0
6, 0, 78, 163, 58704, 590400, 202480300, 9256081380, 4014312232560 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,1

LINKS

Table of n, a(n) for n=4..12.

CROSSREFS

Sequence in context: A191688 A051767 A199044 * A057399 A245086 A145223

Adjacent sequences:  A156485 A156486 A156487 * A156489 A156490 A156491

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 09 2009

STATUS

approved

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Last modified October 14 17:31 EDT 2019. Contains 328022 sequences. (Running on oeis4.)