A307241 - cp's OEIS frontend

A307241 a(0) = 1; a(n) = Sum_{k=1..n} (-1)^(k+1)d(k+1)a(n-k), where d() is the number of divisors (A000005).

n	a(n)
0	1
1	2
2	2
3	3
4	6
5	12
6	23
7	42
8	75
9	135
10	248
11	460
12	849
13	1554
14	2837
15	5192
16	9527
17	17490
18	32083
19	58809
20	107781
21	197578
22	362280
23	664320
24	1218069
25	2233202
26	4094289
27	7506602
28	13763219
29	25234674
30	46266927
31	84828138
32	155528132
33	285154061
34	522819002
35	958568628
36	1757496665
37	3222295912

[1, 2, 2, 3, 6, 12, 23, 42, 75, 135, 248, 460, 849, 1554, 2837, 5192, 9527, 17490, 32083, 58809, 107781, 197578, 362280, 664320, 1218069, 2233202, 4094289, 7506602, 13763219, 25234674, 46266927, 84828138, 155528132, 285154061, 522819002, 958568628, 1757496665, 3222295912]

cp's OEIS Frontend

A307241 a(0) = 1; a(n) = Sum_{k=1..n} (-1)^(k+1)d(k+1)a(n-k), where d() is the number of divisors (A000005).

Table of values

List of values

cp's OEIS Frontend

A307241 a(0) = 1; a(n) = Sum_{k=1..n} (-1)^(k+1)*d(k+1)*a(n-k), where d() is the number of divisors (A000005).

Table of values

List of values

A307241 a(0) = 1; a(n) = Sum_{k=1..n} (-1)^(k+1)d(k+1)a(n-k), where d() is the number of divisors (A000005).