A108716 - cp's OEIS frontend

A108716 a(n) = tan(Pi/14)^(-2n) + tan(3Pi/14)^(-2n) + tan(5Pi/14)^(-2n).

n	a(n)
0	3
1	21
2	371
3	7077
4	135779
5	2606261
6	50028755
7	960335173
8	18434276035
9	353858266965
10	6792546291251
11	130387472704741
12	2502874814474531
13	48044357383337973
14	922243598852422035
15	17703083191185355397

[3, 21, 371, 7077, 135779, 2606261, 50028755, 960335173, 18434276035, 353858266965, 6792546291251, 130387472704741, 2502874814474531, 48044357383337973, 922243598852422035, 17703083191185355397]

cp's OEIS Frontend

A108716 a(n) = tan(Pi/14)^(-2n) + tan(3Pi/14)^(-2n) + tan(5Pi/14)^(-2n).

Table of values

List of values

cp's OEIS Frontend

A108716 a(n) = tan(Pi/14)^(-2n) + tan(3*Pi/14)^(-2n) + tan(5*Pi/14)^(-2n).

Table of values

List of values

A108716 a(n) = tan(Pi/14)^(-2n) + tan(3Pi/14)^(-2n) + tan(5Pi/14)^(-2n).