A075613 - cp's OEIS frontend

A075613 Triangular array read by rows, giving coefficients of P(n,X) = Product_{i=1..2n+1} (X - 1/cos(Pi*k/(2n+1))), a polynomial with integer coefficients.

n	a(n)
1	1
2	1
3	-4
4	-4
5	1
6	1
7	-12
8	-12
9	16
10	16
11	1
12	1
13	-24
14	-24
15	80
16	80
17	-64
18	-64
19	1
20	1
21	-40
22	-40
23	240
24	240
25	-448
26	-448
27	256
28	256
29	1
30	1
31	-60
32	-60
33	560
34	560
35	-1792
36	-1792
37	2304
38	2304
39	-1024
40	-1024
41	1
42	1
43	-84
44	-84
45	1120
46	1120
47	-5376
48	-5376
49	11520
50	11520
51	-11264
52	-11264
53	4096
54	4096
55	1
56	1
57	-112
58	-112
59	2016
60	2016
61	-13440

[1, 1, -4, -4, 1, 1, -12, -12, 16, 16, 1, 1, -24, -24, 80, 80, -64, -64, 1, 1, -40, -40, 240, 240, -448, -448, 256, 256, 1, 1, -60, -60, 560, 560, -1792, -1792, 2304, 2304, -1024, -1024, 1, 1, -84, -84, 1120, 1120, -5376, -5376, 11520, 11520, -11264, -11264, 4096, 4096, 1, 1, -112, -112, 2016, 2016, -13440]

cp's OEIS Frontend

A075613 Triangular array read by rows, giving coefficients of P(n,X) = Product_{i=1..2n+1} (X - 1/cos(Pi*k/(2n+1))), a polynomial with integer coefficients.

Table of values

List of values