A228783 - cp's OEIS frontend

A228783 Table of coefficients of the algebraic number s(2l) = 2sin(Pi/2l) as a polynomial in powers of rho(2l) = 2cos(Pi/(2l)) if l is even and of rho(l) = 2*cos(Pi/l) if l is odd (reduced version).

n	a(n)
1	2
2	0
3	1
4	1
5	0
6	-3
7	0
8	1
9	-1
10	1
11	0
12	4
13	0
14	-1
15	-1
16	-1
17	1
18	0
19	-7
20	0
21	14
22	0
23	-7
24	0
25	1
26	2
27	1
28	-1
29	0
30	8
31	0
32	-18
33	0
34	8
35	0
36	-1
37	1
38	2
39	-3
40	-1
41	1
42	0
43	-8
44	0
45	6
46	0
47	-1
48	0
49	0
50	-1
51	3
52	3
53	-4
54	-1
55	1
56	0
57	12
58	0
59	-67
60	0
61	96
62	0
63	-52
64	0
65	12
66	0
67	-1
68	-2
69	3
70	1
71	-1
72	0
73	-15
74	0
75	140
76	0
77	-378
78	0
79	450
80	0
81	-275
82	0
83	90
84	0
85	-15
86	0
87	1

[2, 0, 1, 1, 0, -3, 0, 1, -1, 1, 0, 4, 0, -1, -1, -1, 1, 0, -7, 0, 14, 0, -7, 0, 1, 2, 1, -1, 0, 8, 0, -18, 0, 8, 0, -1, 1, 2, -3, -1, 1, 0, -8, 0, 6, 0, -1, 0, 0, -1, 3, 3, -4, -1, 1, 0, 12, 0, -67, 0, 96, 0, -52, 0, 12, 0, -1, -2, 3, 1, -1, 0, -15, 0, 140, 0, -378, 0, 450, 0, -275, 0, 90, 0, -15, 0, 1]

cp's OEIS Frontend

A228783 Table of coefficients of the algebraic number s(2l) = 2sin(Pi/2l) as a polynomial in powers of rho(2l) = 2cos(Pi/(2l)) if l is even and of rho(l) = 2*cos(Pi/l) if l is odd (reduced version).

Table of values

List of values

cp's OEIS Frontend

A228783 Table of coefficients of the algebraic number s(2*l) = 2*sin(Pi/2*l) as a polynomial in powers of rho(2*l) = 2*cos(Pi/(2*l)) if l is even and of rho(l) = 2*cos(Pi/l) if l is odd (reduced version).

Table of values

List of values

A228783 Table of coefficients of the algebraic number s(2l) = 2sin(Pi/2l) as a polynomial in powers of rho(2l) = 2cos(Pi/(2l)) if l is even and of rho(l) = 2*cos(Pi/l) if l is odd (reduced version).