A340994 - cp's OEIS frontend

A340994 a(n) is the (2n)-th term of the n-fold self-convolution of the Euler totient function phi.

n	a(n)
0	1
1	1
2	5
3	19
4	89
5	391
6	1817
7	8429
8	39697
9	187849
10	894965
11	4282191
12	20572961
13	99158645
14	479294877
15	2322365959
16	11276837761
17	54860498415
18	267336028565
19	1304677123305
20	6375749480369
21	31195075605755
22	152798541606529
23	749184538847397
24	3676699991008897

[1, 1, 5, 19, 89, 391, 1817, 8429, 39697, 187849, 894965, 4282191, 20572961, 99158645, 479294877, 2322365959, 11276837761, 54860498415, 267336028565, 1304677123305, 6375749480369, 31195075605755, 152798541606529, 749184538847397, 3676699991008897]

cp's OEIS Frontend

A340994 a(n) is the (2n)-th term of the n-fold self-convolution of the Euler totient function phi.

Table of values

List of values