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A156498
Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 36.
0
1, 2, 4, 51, 275, 16008, 175374, 67060718, 1866384501, 2036398653264
OFFSET
1,2
CROSSREFS
Sequence in context: A303382 A303443 A277034 * A211169 A085325 A082661
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 09 2009
STATUS
approved