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.

A309220 Square array A read by antidiagonals: the columns are given by A(n,1)=1, A(n,2)=n+1, A(n,3) = n^2+2n+3, A(n,4) = n^3+3*n^2+6*n+4, A(n,5) = n^4+4*n^3+10*n^2+12*n+7, ..., whose coefficients are given by A104509 (see also A118981).

Table of values

n a(n)
1 1
2 1
3 2
4 1
5 3
6 6
7 1
8 4
9 11
10 14
11 1
12 5
13 18
14 36
15 34
16 1
17 6
18 27
19 76
20 119
21 82
22 1
23 7
24 38
25 140
26 322
27 393
28 198
29 1
30 8
31 51
32 234
33 727
34 1364
35 1298
36 478
37 1
38 9
39 66
40 364
41 1442
42 3775
43 5778
44 4287
45 1154
46 1
47 10
48 83
49 536
50 2599
51 8886
52 19602
53 24476
54 14159
55 2786
56 1
57 11
58 102
59 756
60 4354
61 18557

List of values

[1, 1, 2, 1, 3, 6, 1, 4, 11, 14, 1, 5, 18, 36, 34, 1, 6, 27, 76, 119, 82, 1, 7, 38, 140, 322, 393, 198, 1, 8, 51, 234, 727, 1364, 1298, 478, 1, 9, 66, 364, 1442, 3775, 5778, 4287, 1154, 1, 10, 83, 536, 2599, 8886, 19602, 24476, 14159, 2786, 1, 11, 102, 756, 4354, 18557]