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.

A136247 Triangle T(n,k) read by rows: coefficient [x^k] of the polynomial h(n,x) with h(0,x)=1, h(1,x)=1-x and recursively h(n,x) = 1 + n -(1-x)*(1-h(n-1,x)) - n*h(n-2,x).

Table of values

n a(n)
0 1
1 1
2 -1
3 1
4 -1
5 1
6 1
7 2
8 2
9 -1
10 1
11 6
12 -4
13 -3
14 1
15 1
16 -4
17 -20
18 6
19 4
20 -1
21 1
22 -40
23 8
24 44
25 -8
26 -5
27 1
28 1
29 -12
30 188
31 -6
32 -80
33 10
34 6
35 -1
36 1
37 308
38 136
39 -546
40 -10
41 130
42 -12
43 -7
44 1
45 1
46 416
47 -1864
48 -628
49 1256
50 50
51 -196
52 14
53 8
54 -1
55 1
56 -2664
57 -3640
58 6696
59 1984
60 -2506
61 -126
62 280
63 -16
64 -9
65 1

List of values

[1, 1, -1, 1, -1, 1, 1, 2, 2, -1, 1, 6, -4, -3, 1, 1, -4, -20, 6, 4, -1, 1, -40, 8, 44, -8, -5, 1, 1, -12, 188, -6, -80, 10, 6, -1, 1, 308, 136, -546, -10, 130, -12, -7, 1, 1, 416, -1864, -628, 1256, 50, -196, 14, 8, -1, 1, -2664, -3640, 6696, 1984, -2506, -126, 280, -16, -9, 1]