A192003 Row sums of array A187360: minimal polynomials of 2*cos(Pi/n) evaluated for x=1.

3, 1, 0, -1, -1, -2, -1, -1, -3, 1, 1, -2, 1, 1, -5, -1, -1, 1, -1, 1, 7, 1, 1, -2, -1, 1, -3, 1, -1, 1, -1, -1, -11, 1, 1, 1, 1, 1, 13, 1, -1, 1, -1, 1, 1, 1, 1, -2, -1, 1, -17, 1, -1, 1, 1, 1, 19, 1, 1, 1, 1, 1, 1, -1, 1, 1, -1, 1, -23, 1, 1, 1, 1, 1, -5, 1, 1, 1, -1, 1

Offset

1,1

Links

Table of n, a(n) for n=1..80.

Formula

a(n) = sum(A187360(n,m),m=0..A055034(n)), n>=1.

a(n) = C(n,x=1), with the minimal (monic and integer) polynomial C(n,x) of 2*cos(Pi/n).

Crossrefs

Cf. A187360, A055034, A192004.

Sequence in context: A181434 A294018 A355692 * A226873 A293960 A062719

Adjacent sequences: A192000 A192001 A192002 * A192004 A192005 A192006

Keyword

sign,easy

Author

Wolfdieter Lang, Jul 14 2011

Status

approved