A054524 - OEIS

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A054524

Triangle T(n,k): T(n,k) = mu(k) if k divides n, T(n,k)=0 otherwise (n >= 1, 1<=k<=n).

1, 1, -1, 1, 0, -1, 1, -1, 0, 0, 1, 0, 0, 0, -1, 1, -1, -1, 0, 0, 1, 1, 0, 0, 0, 0, 0, -1, 1, -1, 0, 0, 0, 0, 0, 0, 1, 0, -1, 0, 0, 0, 0, 0, 0, 1, -1, 0, 0, -1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 1, -1, -1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 1, -1

(list; table; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..93.

FORMULA

A054524 = A051731 * A128407 - Gary W. Adamson, Mar 02 2007

MATHEMATICA

Clear[t]; t[n_, 1] = 1; t[n_, k_] := t[n, k] = If[k == 1, 1, If[n == k, -Sum[t[n, k - i], {i, 1, k - 1}], If[n > k, t[n - k, k], 0]]]; Flatten[Table[t[n, k], {n, 13}, {k, n}]] (* Mats Granvik, Feb 12 2012 *)

Table[If[Mod[n, k]==0, MoebiusMu[k], 0], {n, 20}, {k, n}]//Flatten (* Harvey P. Dale, Mar 29 2023 *)

CROSSREFS

Cf. A054521.

Cf. A051731, A128407.

Sequence in context: A363343 A336923 A239681 * A110471 A360116 A255339

Adjacent sequences: A054521 A054522 A054523 * A054525 A054526 A054527

KEYWORD

sign,tabl

AUTHOR

N. J. A. Sloane, Apr 09 2000

STATUS

approved