A108417 Number of subsets of the n-th roots of 1 with absolute value of sum = 1.

0, 1, 2, 6, 8, 10, 36, 14, 64, 72, 180, 22, 720, 26, 924, 600, 2048, 34, 10800, 38, 12240, 2856, 22572, 46, 144000

Offset: 0

Author

Wouter Meeussen, Jun 02 2005

Keywords

• nonn
• more

Comments

a(n) is divisible by n (rotation symmetry). a(n)/n differs from A107754 by a factor of 2 for odd n.

Crossrefs

Row sums of A108416.

Cf. A107754, A103314.

Programs

Mathematica

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