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A156438 Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 5. 0
2, 0, 22, 7, 232, 270, 9312, 40416, 1578064, 10491480, 534495232, 4186295040, 266388662656, 2380048630848, 182963339479264, 1839487795001024, 166774503916789696, 1865501254974930048, 195842622547532763968 (list; graph; refs; listen; history; text; internal format)
OFFSET
2,1
LINKS
CROSSREFS
Sequence in context: A266167 A290465 A256303 * A282134 A293938 A254042
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 09 2009
STATUS
approved

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Last modified February 22 16:01 EST 2024. Contains 370256 sequences. (Running on oeis4.)