A306603 - cp's OEIS frontend

A306603 a(n) = (2 cos(Pi/15))^n + (2 cos(7 Pi/15))^n + (2 cos(11 Pi/15))^n + (2 cos(13 Pi/15))^n.

n	a(n)
0	4
1	-1
2	9
3	-1
4	29
5	4
6	99
7	34
8	349
9	179
10	1254
11	824
12	4559
13	3574
14	16704
15	15004
16	61549
17	61709
18	227799
19	250229
20	846254
21	1004149
22	3153984
23	3997399
24	11788879
25	15812504
26	44178624
27	62229509
28	165946124
29	243873904
30	624650004
31	952400599
32	2355748909
33	3708579599

[4, -1, 9, -1, 29, 4, 99, 34, 349, 179, 1254, 824, 4559, 3574, 16704, 15004, 61549, 61709, 227799, 250229, 846254, 1004149, 3153984, 3997399, 11788879, 15812504, 44178624, 62229509, 165946124, 243873904, 624650004, 952400599, 2355748909, 3708579599]

cp's OEIS Frontend

A306603 a(n) = (2 cos(Pi/15))^n + (2 cos(7 Pi/15))^n + (2 cos(11 Pi/15))^n + (2 cos(13 Pi/15))^n.

Table of values

List of values