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A156472
Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 20.
0
2, 6, 60, 1239, 112892, 47944020, 53004021504, 118418512901454, 524860935683590152
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OFFSET
2,1
LINKS
Table of n, a(n) for n=2..10.
CROSSREFS
Sequence in context:
A089039
A156451
A152617
*
A108640
A084971
A224883
Adjacent sequences:
A156469
A156470
A156471
*
A156473
A156474
A156475
KEYWORD
nonn
AUTHOR
R. H. Hardin
Feb 09 2009
STATUS
approved
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Last modified August 30 19:27 EDT 2024. Contains 375545 sequences. (Running on oeis4.)