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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.

A064766 Fill up an infinite triangular array by rows by successively writing numbers 1, then 1 up to 2*3/2, then 1 up to 3*4/2, then 1 up to 4*5/2 and so on, at the k-th step writing the numbers from 1 up to the k-th triangular number. The final elements of the rows of this infinite triangle form the sequence.

Table of values

n a(n)
0 1
1 2
2 2
3 6
4 5
5 1
6 8
7 1
8 10
9 20
10 10
11 22
12 7
13 21
14 36
15 16
16 33
17 6
18 25
19 45
20 11
21 33
22 56
23 14
24 39
25 65
26 14
27 42
28 71
29 10
30 41
31 73
32 1
33 35
34 70
35 106
36 23
37 61
38 100
39 4
40 45
41 87
42 130
43 21
44 66
45 112
46 159
47 36
48 85
49 135
50 186
51 48
52 101
53 155
54 210
55 56
56 113
57 171
58 230
59 59
60 120
61 182
62 245
63 56
64 121
65 187

List of values

[1, 2, 2, 6, 5, 1, 8, 1, 10, 20, 10, 22, 7, 21, 36, 16, 33, 6, 25, 45, 11, 33, 56, 14, 39, 65, 14, 42, 71, 10, 41, 73, 1, 35, 70, 106, 23, 61, 100, 4, 45, 87, 130, 21, 66, 112, 159, 36, 85, 135, 186, 48, 101, 155, 210, 56, 113, 171, 230, 59, 120, 182, 245, 56, 121, 187]

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

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