A082936 - cp's OEIS frontend

A082936 a(n) = (1/(3n))Sum_{d|n, d even} phi(2n/d)binomial(3d/2,d).

n	a(n)
0	1
1	1
2	3
3	10
4	43
5	201
6	1038
7	5538
8	30667
9	173593
10	1001603
11	5864750
12	34769374
13	208267320
14	1258579654
15	7663720710
16	46976034379
17	289628805623
18	1794932468571
19	11175157356522
20	69864075597643
21	438403736549145
22	2760351032959050
23	17433869214973754
24	110420300879752990

[1, 1, 3, 10, 43, 201, 1038, 5538, 30667, 173593, 1001603, 5864750, 34769374, 208267320, 1258579654, 7663720710, 46976034379, 289628805623, 1794932468571, 11175157356522, 69864075597643, 438403736549145, 2760351032959050, 17433869214973754, 110420300879752990]

cp's OEIS Frontend

A082936 a(n) = (1/(3n))Sum_{d|n, d even} phi(2n/d)binomial(3d/2,d).

Table of values

List of values

cp's OEIS Frontend

A082936 a(n) = (1/(3*n))*Sum_{d|n, d even} phi(2*n/d)*binomial(3d/2,d).

Table of values

List of values

A082936 a(n) = (1/(3n))Sum_{d|n, d even} phi(2n/d)binomial(3d/2,d).