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A156473
Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 20.
0
2, 0, 32, 75, 3154, 31638, 4561976, 75335814, 23873894500, 748560286220, 449126699046010
OFFSET
2,1
CROSSREFS
Sequence in context: A156481 A176726 A156452 * A156504 A340545 A009665
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 09 2009
STATUS
approved