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A341698
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a(1) = a(2) = 1; a(n+1) = -Sum_{d|n, d < n} a(n/d) * a(d).
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2
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1, 1, -1, 1, -2, 2, 0, 0, -2, 1, 3, -3, 1, -1, 1, -5, 4, -4, 12, -12, 14, -14, 8, -8, 10, -14, 12, -16, 18, -18, 26, -26, 36, -30, 22, -22, 24, -24, 0, 2, 20, -20, -10, 10, 12, -18, 2, -2, 14, -14, -2, 10, 16, -16, -8, 20, 14, 10, -46, 46, -52, 52, -104, 132, -70, 74, -186, 186, -134, 150
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OFFSET
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1,5
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LINKS
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MATHEMATICA
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a[1] = a[2] = 1; a[n_] := a[n] = -Sum[If[d < (n - 1), a[(n - 1)/d] a[d], 0], {d, Divisors[n - 1]}]; Table[a[n], {n, 70}]
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PROG
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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