A309041 - cp's OEIS frontend

A309041 Irregular table read by rows: Let P(n,x) be the (monic) minimal polynomial of 2i*cos(Pi/n), where i = sqrt(-1) is the imaginary unit, then a(n,k) = [x^(2k)] P(n,x), n >= 3.

n	a(n)
3	1
4	1
5	2
6	1
7	1
8	3
9	1
10	3
11	1
12	1
13	6
14	5
15	1
16	2
17	4
18	1
19	1
20	9
21	6
22	1
23	5
24	5
25	1
26	1
27	15
28	35
29	28
30	9
31	1
32	1
33	4
34	1
35	1
36	21
37	70
38	84
39	45
40	11
41	1
42	7
43	14
44	7
45	1
46	1
47	24
48	26
49	9
50	1
51	2
52	16
53	20
54	8
55	1
56	1
57	36
58	210
59	462
60	495
61	286
62	91
63	15
64	1
65	3
66	9
67	6
68	1
69	1
70	45
71	330
72	924
73	1287
74	1001
75	455
76	120
77	17
78	1

[1, 1, 2, 1, 1, 3, 1, 3, 1, 1, 6, 5, 1, 2, 4, 1, 1, 9, 6, 1, 5, 5, 1, 1, 15, 35, 28, 9, 1, 1, 4, 1, 1, 21, 70, 84, 45, 11, 1, 7, 14, 7, 1, 1, 24, 26, 9, 1, 2, 16, 20, 8, 1, 1, 36, 210, 462, 495, 286, 91, 15, 1, 3, 9, 6, 1, 1, 45, 330, 924, 1287, 1001, 455, 120, 17, 1]

cp's OEIS Frontend

A309041 Irregular table read by rows: Let P(n,x) be the (monic) minimal polynomial of 2i*cos(Pi/n), where i = sqrt(-1) is the imaginary unit, then a(n,k) = [x^(2k)] P(n,x), n >= 3.

Table of values

List of values