A273161 - cp's OEIS frontend

A273161 a(n) = Sum_{k=1..n} C(n-k, floor((n-k)/k)).

n	a(n)
0	0
1	1
2	2
3	3
4	5
5	7
6	13
7	19
8	34
9	61
10	108
11	174
12	384
13	641
14	1166
15	2337
16	4458
17	7828
18	16421
19	29346
20	57231
21	114126
22	215915
23	396491
24	839324
25	1549146
26	2983185
27	5978656
28	11628952
29	21812113
30	45099914
31	84842925
32	166417181
33	332267593
34	647614074
35	1234586894
36	2538571022

[0, 1, 2, 3, 5, 7, 13, 19, 34, 61, 108, 174, 384, 641, 1166, 2337, 4458, 7828, 16421, 29346, 57231, 114126, 215915, 396491, 839324, 1549146, 2983185, 5978656, 11628952, 21812113, 45099914, 84842925, 166417181, 332267593, 647614074, 1234586894, 2538571022]

cp's OEIS Frontend

A273161 a(n) = Sum_{k=1..n} C(n-k, floor((n-k)/k)).

Table of values

List of values