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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A093315 Number of permutations s_1,s_2,...,s_n of 1,2,...,n with s_1 = 4 and such that for all j=1,2,...,n, s_j divides Sum_{i=1..j} s_i.

Table of values

n a(n)
1 0
2 0
3 0
4 1
5 2
6 2
7 2
8 0
9 0
10 0
11 0
12 1
13 1
14 0
15 1
16 1
17 1
18 0
19 0
20 0
21 0
22 0
23 0
24 6
25 8
26 3
27 14
28 12
29 18
30 13
31 14
32 6
33 26
34 13
35 198
36 152
37 220
38 118
39 1033
40 807

List of values

[0, 0, 0, 1, 2, 2, 2, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 6, 8, 3, 14, 12, 18, 13, 14, 6, 26, 13, 198, 152, 220, 118, 1033, 807]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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