A152189 - cp's OEIS frontend

A152189 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	8
4	9
5	55
6	64
7	377
8	441
9	2584
10	3025
11	17711
12	20736
13	121393
14	142129
15	832040
16	974169
17	5702887
18	6677056
19	39088169
20	45765225
21	267914296
22	313679521
23	1836311903
24	2149991424
25	12586269025
26	14736260449
27	86267571272
28	101003831721
29	591286729879
30	692290561600

[1, 1, 1, 8, 9, 55, 64, 377, 441, 2584, 3025, 17711, 20736, 121393, 142129, 832040, 974169, 5702887, 6677056, 39088169, 45765225, 267914296, 313679521, 1836311903, 2149991424, 12586269025, 14736260449, 86267571272, 101003831721, 591286729879, 692290561600]

cp's OEIS Frontend

A152189 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

A152189 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

A152189 Product_{k=1..floor((n-1)/2)} (1 + 4cos(kPi/n)^2)(1 + 4sin(k*Pi/n)^2).