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A156429
Number of 20 X 20 arrays of squares of integers, symmetric under 90-degree rotation, with all rows summing to n.
0
1, 30240, 569744280, 1972495637280, 1600434039456630, 374736233227188672
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OFFSET
0,2
LINKS
Table of n, a(n) for n=0..5.
CROSSREFS
Sequence in context:
A218029
A323991
A109485
*
A171263
A233731
A187376
Adjacent sequences:
A156426
A156427
A156428
*
A156430
A156431
A156432
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Feb 09 2009
STATUS
approved
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Last modified August 20 07:51 EDT 2024. Contains 375314 sequences. (Running on oeis4.)