A317853 - cp's OEIS frontend

A317853 a(1) = 1; a(n > 1) = Sum_{0 < k < n} (-1)^(n - k - 1) a(n - k) Sum_{d|k} a(d).

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	2
7	5
8	6
9	11
10	14
11	23
12	26
13	51
14	70
15	114
16	147
17	237
18	314
19	516
20	715
21	1118
22	1549
23	2353
24	3252
25	5011
26	7235
27	10724
28	15142
29	22504
30	32506
31	47770
32	69173
33	100980
34	146657
35	212504
36	308563
37	448256
38	658037
39	946166
40	1373739
41	1988283
42	2919185
43	4197886
44	6118850

[1, 1, 1, 1, 2, 2, 5, 6, 11, 14, 23, 26, 51, 70, 114, 147, 237, 314, 516, 715, 1118, 1549, 2353, 3252, 5011, 7235, 10724, 15142, 22504, 32506, 47770, 69173, 100980, 146657, 212504, 308563, 448256, 658037, 946166, 1373739, 1988283, 2919185, 4197886, 6118850]

cp's OEIS Frontend

A317853 a(1) = 1; a(n > 1) = Sum_{0 < k < n} (-1)^(n - k - 1) a(n - k) Sum_{d|k} a(d).

Table of values

List of values