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.

A209557 Triangle of coefficients of polynomials u(n,x) jointly generated with A209558; see the Formula section.

Table of values

n a(n)
1 1
2 1
3 1
4 2
5 3
6 1
7 2
8 7
9 7
10 1
11 3
12 9
13 18
14 15
15 1
16 3
17 16
18 30
19 41
20 31
21 1
22 4
23 18
24 60
25 87
26 88
27 63
28 1
29 4
30 28
31 78
32 189
33 232
34 183
35 127
36 1
37 5
38 30
39 136
40 285
41 535
42 585
43 374
44 255
45 1
46 5
47 43
48 160
49 541
50 931
51 1410
52 1418
53 757
54 511
55 1
56 6
57 45
58 255
59 705
60 1886
61 2808
62 3534
63 3339
64 1524

List of values

[1, 1, 1, 2, 3, 1, 2, 7, 7, 1, 3, 9, 18, 15, 1, 3, 16, 30, 41, 31, 1, 4, 18, 60, 87, 88, 63, 1, 4, 28, 78, 189, 232, 183, 127, 1, 5, 30, 136, 285, 535, 585, 374, 255, 1, 5, 43, 160, 541, 931, 1410, 1418, 757, 511, 1, 6, 45, 255, 705, 1886, 2808, 3534, 3339, 1524]