cp's OEIS Frontend

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.

A355257 Array read by ascending antidiagonals. A(n, k) = k! * [x^k] log((1 - x) / (1 - 2*x)) / (1 - x)^n, for 0 <= k <= n.

Table of values

n a(n)
0 0
1 0
2 1
3 0
4 1
5 3
6 0
7 1
8 5
9 14
10 0
11 1
12 7
13 29
14 90
15 0
16 1
17 9
18 50
19 206
20 744
21 0
22 1
23 11
24 77
25 406
26 1774
27 7560
28 0
29 1
30 13
31 110
32 714
33 3804
34 18204
35 91440
36 0
37 1
38 15
39 149
40 1154
41 7374
42 41028
43 218868
44 1285200
45 0
46 1
47 17
48 194
49 1750
50 13144
51 85272
52 506064
53 3036144
54 20603520

List of values

[0, 0, 1, 0, 1, 3, 0, 1, 5, 14, 0, 1, 7, 29, 90, 0, 1, 9, 50, 206, 744, 0, 1, 11, 77, 406, 1774, 7560, 0, 1, 13, 110, 714, 3804, 18204, 91440, 0, 1, 15, 149, 1154, 7374, 41028, 218868, 1285200, 0, 1, 17, 194, 1750, 13144, 85272, 506064, 3036144, 20603520]