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 A343190 a(1) = ... = a(5) = 1; a(n+5) = Sum_{d|n} mu(n/d) * a(d). 2
 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, -1, -1, -1, -1, -1, -2, -2, -1, -2, -1, -3, -2, -2, -2, -1, -3, -3, 0, -3, 0, -3, -2, -1, -1, -1, -2, -2, 1, -1, 3, -3, -1, 2, 2, 2, -1, -2, 5, 4, 4, -2, 1, 5, 7, 6, -1, 0, 10, 7, 10, 0, 0, 9, 14, 9, 0, 2, 12, 15, 14, -1, 3, 14, 18 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,17 LINKS MATHEMATICA a[1] = a[2] = a[3] = a[4] = a[5] = 1; a[n_] := a[n] = Sum[MoebiusMu[(n - 5)/d] a[d], {d, Divisors[n - 5]}]; Table[a[n], {n, 75}] CROSSREFS Cf. A007554, A307995, A318583, A343188, A343189. Sequence in context: A298824 A343384 A237615 * A256132 A340057 A303476 Adjacent sequences:  A343187 A343188 A343189 * A343191 A343192 A343193 KEYWORD sign AUTHOR Ilya Gutkovskiy, Apr 07 2021 STATUS approved

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Last modified September 25 20:01 EDT 2021. Contains 347659 sequences. (Running on oeis4.)