A105863 - cp's OEIS frontend

A105863 a(n) = n * Sum_{d|n} (binomial(n,d) / gcd(n,d)).

n	a(n)
1	1
2	6
3	12
4	44
5	30
6	252
7	56
8	856
9	846
10	3080
11	132
12	20616
13	182
14	49532
15	52110
16	237232
17	306
18	1227096
19	380
20	4106320
21	2470272
22	15525092
23	552
24	86092176
25	1328900
26	270424752
27	126624006
28	1157002616
29	870
30	5577100260
31	992
32	19572325728
33	6386892930

[1, 6, 12, 44, 30, 252, 56, 856, 846, 3080, 132, 20616, 182, 49532, 52110, 237232, 306, 1227096, 380, 4106320, 2470272, 15525092, 552, 86092176, 1328900, 270424752, 126624006, 1157002616, 870, 5577100260, 992, 19572325728, 6386892930]

cp's OEIS Frontend

A105863 a(n) = n * Sum_{d|n} (binomial(n,d) / gcd(n,d)).

Table of values

List of values