A291518 - cp's OEIS frontend

A291518 Number of permutations s_1,s_2,...,s_n of 1,2,...,n with s_n = n (if n>0) and such that for all j=1,2,...,n, Sum_{i=1..j} s_i divides Sum_{i=1..j} s_i^3.

n	a(n)
0	1
1	1
2	1
3	2
4	6
5	12
6	30
7	78
8	186
9	414
10	912
11	2064
12	4338
13	9798
14	20106
15	40974
16	80196
17	158322
18	309414
19	615558
20	1212402
21	2417136
22	4776654
23	9497508
24	18726708
25	37056150
26	72946116
27	144230640
28	284660874
29	564451830
30	1118803818
31	2224792026
32	4420041210
33	8791590168

[1, 1, 1, 2, 6, 12, 30, 78, 186, 414, 912, 2064, 4338, 9798, 20106, 40974, 80196, 158322, 309414, 615558, 1212402, 2417136, 4776654, 9497508, 18726708, 37056150, 72946116, 144230640, 284660874, 564451830, 1118803818, 2224792026, 4420041210, 8791590168]

cp's OEIS Frontend

A291518 Number of permutations s_1,s_2,...,s_n of 1,2,...,n with s_n = n (if n>0) and such that for all j=1,2,...,n, Sum_{i=1..j} s_i divides Sum_{i=1..j} s_i^3.

Table of values

List of values