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.

A261720 Array of pyramidal (3-dimensional figurate numbers) read by antidiagonals.

Table of values

n a(n)
1 1
2 1
3 4
4 1
5 5
6 10
7 1
8 6
9 14
10 20
11 1
12 7
13 18
14 30
15 35
16 1
17 8
18 22
19 40
20 55
21 56
22 1
23 9
24 26
25 50
26 75
27 91
28 84
29 1
30 10
31 30
32 60
33 95
34 126
35 140
36 120
37 1
38 11
39 34
40 70
41 115
42 161
43 196
44 204
45 165
46 1
47 12
48 38
49 80
50 135
51 196
52 252
53 288
54 285
55 220
56 1
57 13
58 42
59 90
60 155
61 231
62 308
63 372
64 405
65 385
66 286

List of values

[1, 1, 4, 1, 5, 10, 1, 6, 14, 20, 1, 7, 18, 30, 35, 1, 8, 22, 40, 55, 56, 1, 9, 26, 50, 75, 91, 84, 1, 10, 30, 60, 95, 126, 140, 120, 1, 11, 34, 70, 115, 161, 196, 204, 165, 1, 12, 38, 80, 135, 196, 252, 288, 285, 220, 1, 13, 42, 90, 155, 231, 308, 372, 405, 385, 286]

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

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