A152192 - cp's OEIS frontend

A152192 a(n) = Product_{k=1..floor((n-1)/2)} (1 + 4cos(2Pi*k/n)^2).

n	a(n)
0	1
1	1
2	1
3	2
4	1
5	5
6	4
7	13
8	9
9	34
10	25
11	89
12	64
13	233
14	169
15	610
16	441
17	1597
18	1156
19	4181
20	3025
21	10946
22	7921
23	28657
24	20736
25	75025
26	54289
27	196418
28	142129
29	514229
30	372100
31	1346269
32	974169
33	3524578
34	2550409
35	9227465
36	6677056
37	24157817
38	17480761
39	63245986
40	45765225

[1, 1, 1, 2, 1, 5, 4, 13, 9, 34, 25, 89, 64, 233, 169, 610, 441, 1597, 1156, 4181, 3025, 10946, 7921, 28657, 20736, 75025, 54289, 196418, 142129, 514229, 372100, 1346269, 974169, 3524578, 2550409, 9227465, 6677056, 24157817, 17480761, 63245986, 45765225]

cp's OEIS Frontend

A152192 a(n) = Product_{k=1..floor((n-1)/2)} (1 + 4cos(2Pi*k/n)^2).

Table of values

List of values

cp's OEIS Frontend

A152192 a(n) = Product_{k=1..floor((n-1)/2)} (1 + 4*cos(2*Pi*k/n)^2).

Table of values

List of values

A152192 a(n) = Product_{k=1..floor((n-1)/2)} (1 + 4cos(2Pi*k/n)^2).