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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.

A001521 a(1) = 1; thereafter a(n+1) = floor(sqrt(2*a(n)*(a(n)+1))).

Table of values

n a(n)
1 1
2 2
3 3
4 4
5 6
6 9
7 13
8 19
9 27
10 38
11 54
12 77
13 109
14 154
15 218
16 309
17 437
18 618
19 874
20 1236
21 1748
22 2472
23 3496
24 4944
25 6992
26 9888
27 13984
28 19777
29 27969
30 39554
31 55938
32 79108
33 111876
34 158217
35 223753
36 316435
37 447507
38 632871
39 895015
40 1265743
41 1790031
42 2531486
43 3580062
44 5062972

List of values

[1, 2, 3, 4, 6, 9, 13, 19, 27, 38, 54, 77, 109, 154, 218, 309, 437, 618, 874, 1236, 1748, 2472, 3496, 4944, 6992, 9888, 13984, 19777, 27969, 39554, 55938, 79108, 111876, 158217, 223753, 316435, 447507, 632871, 895015, 1265743, 1790031, 2531486, 3580062, 5062972]

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

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