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.

A225200 Triangle (read by rows) of coefficients of the polynomials (in ascending order) of the denominators of the generalized sequence of fractions f(n) defined recursively by f(1) = m/1; f(n+1) is chosen so that the sum and the product of the first n terms of the sequence are equal.

Table of values

n a(n)
1 1
2 -1
3 1
4 1
5 -1
6 1
7 1
8 -2
9 2
10 -1
11 1
12 1
13 -4
14 8
15 -10
16 9
17 -6
18 3
19 -1
20 1
21 1
22 -8
23 32
24 -84
25 162
26 -244
27 298
28 -302
29 258
30 -188
31 118
32 -64
33 30
34 -12
35 4
36 -1
37 1
38 1
39 -16
40 128
41 -680
42 2692
43 -8456
44 21924
45 -48204
46 91656
47 -152952
48 226580
49 -300664
50 359992
51 -391232
52 387820
53 -352074
54 293685
55 -225696
56 160120
57 -105024
58 63750
59 -35832
60 18654
61 -8994
62 4014
63 -1656
64 630
65 -220
66 70
67 -20
68 5
69 -1
70 1

List of values

[1, -1, 1, 1, -1, 1, 1, -2, 2, -1, 1, 1, -4, 8, -10, 9, -6, 3, -1, 1, 1, -8, 32, -84, 162, -244, 298, -302, 258, -188, 118, -64, 30, -12, 4, -1, 1, 1, -16, 128, -680, 2692, -8456, 21924, -48204, 91656, -152952, 226580, -300664, 359992, -391232, 387820, -352074, 293685, -225696, 160120, -105024, 63750, -35832, 18654, -8994, 4014, -1656, 630, -220, 70, -20, 5, -1, 1]