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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.

A262260 Number of triangles formed by the positions of odd numbers in the first n rows of Pascal's triangle, also known as Tartaglia's triangle.

Table of values

n a(n)
0 0
1 1
2 1
3 4
4 4
5 6
6 6
7 13
8 13
9 15
10 15
11 21
12 21
13 25
14 25
15 40
16 40
17 42
18 42
19 48
20 48
21 52
22 52
23 66
24 66
25 70
26 70
27 82
28 82
29 90
30 90
31 121
32 121
33 123
34 123
35 129
36 129
37 133
38 133
39 147
40 147
41 151
42 151
43 163
44 163
45 171
46 171
47 201
48 201
49 205
50 205
51 217
52 217
53 225
54 225
55 253
56 253
57 261
58 261
59 285
60 285
61 301
62 301
63 364
64 364

List of values

[0, 1, 1, 4, 4, 6, 6, 13, 13, 15, 15, 21, 21, 25, 25, 40, 40, 42, 42, 48, 48, 52, 52, 66, 66, 70, 70, 82, 82, 90, 90, 121, 121, 123, 123, 129, 129, 133, 133, 147, 147, 151, 151, 163, 163, 171, 171, 201, 201, 205, 205, 217, 217, 225, 225, 253, 253, 261, 261, 285, 285, 301, 301, 364, 364]

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

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