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Search: id:A059381
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| 1, 3, 24, 288, 6912, 165888, 7962624, 382205952, 27518828544, 1981355655168, 237762678620160, 22825217147535360, 3834636480785940480, 552187653233175429120, 106020029420769682391040, 20355845648787779019079680, 5862483546850880357494947840
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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a(n) is also the determinant of the symmetric n X n matrix M defined by M(i,j) = gcd(i,j)^2 for 1 <= i,j <= n - Avi Peretz (njk(AT)netvision.net.il), Mar 22 2001
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REFERENCES
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L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 203, #17.
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CROSSREFS
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Cf. A001088.
Sequence in context: A064037 A128572 A052592 this_sequence A138209 A075142 A138428
Adjacent sequences: A059378 A059379 A059380 this_sequence A059382 A059383 A059384
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Jan 28 2001
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