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A156474
Number of n X n arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to 20.
0
4, 7, 78, 660, 19896, 352350, 29182380, 1150637340, 215977376730
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OFFSET
4,1
LINKS
Table of n, a(n) for n=4..12.
CROSSREFS
Sequence in context:
A135790
A253202
A368271
*
A136276
A072954
A322723
Adjacent sequences:
A156471
A156472
A156473
*
A156475
A156476
A156477
KEYWORD
nonn
AUTHOR
R. H. Hardin
Feb 09 2009
STATUS
approved
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Last modified April 18 22:18 EDT 2024. Contains 371782 sequences. (Running on oeis4.)