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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.

A086272 Rectangular array T(n,k) of central polygonal numbers, by antidiagonals.

Table of values

n a(n)
1 1
2 3
3 1
4 7
5 4
6 1
7 13
8 10
9 5
10 1
11 21
12 19
13 13
14 6
15 1
16 31
17 31
18 25
19 16
20 7
21 1
22 43
23 46
24 41
25 31
26 19
27 8
28 1
29 57
30 64
31 61
32 51
33 37
34 22
35 9
36 1
37 73
38 85
39 85
40 76
41 61
42 43
43 25
44 10
45 1
46 91
47 109
48 113
49 106
50 91
51 71
52 49
53 28
54 11
55 1
56 111
57 136
58 145
59 141
60 127
61 106
62 81
63 55
64 31
65 12
66 1
67 133
68 166
69 181
70 181
71 169

List of values

[1, 3, 1, 7, 4, 1, 13, 10, 5, 1, 21, 19, 13, 6, 1, 31, 31, 25, 16, 7, 1, 43, 46, 41, 31, 19, 8, 1, 57, 64, 61, 51, 37, 22, 9, 1, 73, 85, 85, 76, 61, 43, 25, 10, 1, 91, 109, 113, 106, 91, 71, 49, 28, 11, 1, 111, 136, 145, 141, 127, 106, 81, 55, 31, 12, 1, 133, 166, 181, 181, 169]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.