A152191 - cp's OEIS frontend

A152191 a(n)=Product_{k=1..floor((n-1)/2)} (1 + 4cos(kPi/n)^2)(1 - 4sin(k*Pi/n)^2).

n	a(n)
0	1
1	1
2	1
3	-4
4	-3
5	5
6	0
7	13
8	21
9	-68
10	-55
11	89
12	0
13	233
14	377
15	-1220
16	-987
17	1597
18	0
19	4181
20	6765
21	-21892
22	-17711
23	28657
24	0
25	75025
26	121393
27	-392836
28	-317811
29	514229
30	0
31	1346269
32	2178309
33	-7049156
34	-5702887
35	9227465
36	0
37	24157817
38	39088169
39	-126491972
40	-102334155

[1, 1, 1, -4, -3, 5, 0, 13, 21, -68, -55, 89, 0, 233, 377, -1220, -987, 1597, 0, 4181, 6765, -21892, -17711, 28657, 0, 75025, 121393, -392836, -317811, 514229, 0, 1346269, 2178309, -7049156, -5702887, 9227465, 0, 24157817, 39088169, -126491972, -102334155]

cp's OEIS Frontend

A152191 a(n)=Product_{k=1..floor((n-1)/2)} (1 + 4cos(kPi/n)^2)(1 - 4sin(k*Pi/n)^2).

Table of values

List of values

cp's OEIS Frontend

A152191 a(n)=Product_{k=1..floor((n-1)/2)} (1 + 4*cos(k*Pi/n)^2)*(1 - 4*sin(k*Pi/n)^2).

Table of values

List of values

A152191 a(n)=Product_{k=1..floor((n-1)/2)} (1 + 4cos(kPi/n)^2)(1 - 4sin(k*Pi/n)^2).