A291519 - cp's OEIS frontend

A291519 Number of permutations s_1,s_2,...,s_n of 1,2,...,n with s_n = 1 (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	18
6	42
7	90
8	228
9	498
10	1152
11	2274
12	5460
13	10308
14	20868
15	39222
16	78126
17	151092
18	306144
19	596796
20	1204734
21	2359518
22	4720854
23	9229200
24	18329442
25	35889966
26	71284524
27	140430234
28	279790956
29	554351988
30	1105988208
31	2195249184
32	4371548958
33	8665192968

[1, 1, 1, 2, 6, 18, 42, 90, 228, 498, 1152, 2274, 5460, 10308, 20868, 39222, 78126, 151092, 306144, 596796, 1204734, 2359518, 4720854, 9229200, 18329442, 35889966, 71284524, 140430234, 279790956, 554351988, 1105988208, 2195249184, 4371548958, 8665192968]

cp's OEIS Frontend

A291519 Number of permutations s_1,s_2,...,s_n of 1,2,...,n with s_n = 1 (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