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A156469
Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 18.
0
1, 4, 54, 112, 5414, 21624, 2133044, 23029656, 5468265896, 163052061000, 97305384072800
OFFSET
2,2
CROSSREFS
Sequence in context: A158259 A362050 A095210 * A001545 A208954 A269507
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 09 2009
STATUS
approved