A156260 - OEIS

A156260

Row sums of A156254.

1, 2, 2, 1, 2, 4, 2, 1, 1, 4, 2, 1, 2, 4, 4, 1, 2, 1, 2, 1, 4, 4, 2, 1, 1, 4, 1, 1, 2, 8, 2, 1, 4, 4, 4, 1, 2, 4, 4, 1, 2, 8, 2, 1, 1, 4, 2, 1, 1, 1, 4, 1, 2, 1, 4, 1, 4, 4, 2, 1, 2, 4, 1, 1, 4, 8, 2, 1, 4, 8, 2, 1, 2, 4, 1

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OFFSET

1,2

LINKS

Mats Granvik, Table of n, a(n) for n = 1..1500

MATHEMATICA

nn = 75; Total[Transpose[Inverse[Table[Table[If[Mod[n, k] == 0, If[n == k, 1, MoebiusMu[n]*MoebiusMu[k]], 0], {k, 1, nn}], {n, 1, nn}]]]] (* Mats Granvik, Jul 23 2017 *)

CROSSREFS

Cf. A156254.

Sequence in context: A048106 A304649 A228441 * A056671 A354349 A278763

Adjacent sequences: A156257 A156258 A156259 * A156261 A156262 A156263

KEYWORD

nonn

AUTHOR

Mats Granvik, Feb 07 2009

STATUS

approved