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Search: id:A071084
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| A071084 |
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Determinant of the n X n matrix whose element (i,j) equals t(|i-j|) where t(n) is the number of divisors of n and t(0) = 0. |
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+0
3
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| 0, -1, 4, -7, 10, 68, -578, 3825, -14508, 38367, -46170, 37125, 740520, 7341147, -211529660, 2662060613, -31141230062, 234276517760, -1130151516242, 4893200552669, -6576135166508
(list; graph; listen)
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OFFSET
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1,3
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MATHEMATICA
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f[n_] := Det[ Table[ If[i == j, 0, DivisorSigma[0, Abs[i - j]]], {i, 1, n}, {j, 1, n}]]; Table[Abs[f[n]], {n, 1, 21}]
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CROSSREFS
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Adjacent sequences: A071081 A071082 A071083 this_sequence A071085 A071086 A071087
Sequence in context: A100591 A135262 A061515 this_sequence A032547 A075630 A023985
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KEYWORD
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sign
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), May 26 2002
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