A067957 - cp's OEIS frontend

A067957 Number of divisor chains of length n: permutations s_1,s_2,...,s_n of 1,2,...,n such that for all j=1,2,...,n, s_j divides Sum_{i=1..j} s_i.

n	a(n)
0	1
1	1
2	1
3	2
4	2
5	4
6	5
7	7
8	7
9	24
10	22
11	29
12	39
13	67
14	55
15	386
16	235
17	312
18	347
19	451
20	1319
21	5320
22	3220
23	4489
24	20237
25	36580
26	52875
27	197103
28	216562
29	289478
30	567396
31	659647
32	1111153
33	3131774
34	2200426
35	29523302
36	34214028
37	48161995
38	32616148
39	242860900
40	293579041
41	363415618

[1, 1, 1, 2, 2, 4, 5, 7, 7, 24, 22, 29, 39, 67, 55, 386, 235, 312, 347, 451, 1319, 5320, 3220, 4489, 20237, 36580, 52875, 197103, 216562, 289478, 567396, 659647, 1111153, 3131774, 2200426, 29523302, 34214028, 48161995, 32616148, 242860900, 293579041, 363415618]

cp's OEIS Frontend

A067957 Number of divisor chains of length n: permutations s_1,s_2,...,s_n of 1,2,...,n such that for all j=1,2,...,n, s_j divides Sum_{i=1..j} s_i.

Table of values

List of values