A364210 - cp's OEIS frontend

A364210 a(n) = (1/(2n)) Sum_{d|n} 3^(n/d-1) * phi(3*d).

n	a(n)
1	1
2	2
3	4
4	8
5	17
6	44
7	105
8	278
9	733
10	1978
11	5369
12	14792
13	40881
14	113934
15	318884
16	896948
17	2532161
18	7174862
19	20390553
20	58114072
21	166037460
22	475473286
23	1364393897
24	3922640132
25	11297181473
26	32588043882
27	94143179560
28	272342824320
29	788854912241
30	2287679406940
31	6641649422409

[1, 2, 4, 8, 17, 44, 105, 278, 733, 1978, 5369, 14792, 40881, 113934, 318884, 896948, 2532161, 7174862, 20390553, 58114072, 166037460, 475473286, 1364393897, 3922640132, 11297181473, 32588043882, 94143179560, 272342824320, 788854912241, 2287679406940, 6641649422409]

cp's OEIS Frontend

A364210 a(n) = (1/(2n)) Sum_{d|n} 3^(n/d-1) * phi(3*d).

Table of values

List of values

cp's OEIS Frontend

A364210 a(n) = (1/(2*n)) * Sum_{d|n} 3^(n/d-1) * phi(3*d).

Table of values

List of values

A364210 a(n) = (1/(2n)) Sum_{d|n} 3^(n/d-1) * phi(3*d).