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A156504 Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 40. 0
2, 0, 32, 114, 16570, 196824, 116949508, 3753914276, 4711859922047 (list; graph; refs; listen; history; text; internal format)
OFFSET
2,1
LINKS
CROSSREFS
Sequence in context: A176726 A156452 A156473 * A340545 A009665 A053552
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 09 2009
STATUS
approved

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Last modified March 29 09:59 EDT 2024. Contains 371268 sequences. (Running on oeis4.)