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Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!) A156472 Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 20. 0 2, 6, 60, 1239, 112892, 47944020, 53004021504, 118418512901454, 524860935683590152 (list; graph; refs; listen; history; text; internal format) OFFSET 2,1 LINKS Table of n, a(n) for n=2..10. CROSSREFS Sequence in context: A089039 A156451 A152617 * A108640 A084971 A224883 Adjacent sequences: A156469 A156470 A156471 * A156473 A156474 A156475 KEYWORD nonn AUTHOR R. H. Hardin Feb 09 2009 STATUS approved

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Last modified August 30 19:27 EDT 2024. Contains 375545 sequences. (Running on oeis4.)