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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.

A024810 a(n) = floor( tan(m*Pi/2) ), where m = 1 - 2^(-n).

Table of values

n a(n)
1 1
2 2
3 5
4 10
5 20
6 40
7 81
8 162
9 325
10 651
11 1303
12 2607
13 5215
14 10430
15 20860
16 41721
17 83443
18 166886
19 333772
20 667544
21 1335088
22 2670176
23 5340353
24 10680707
25 21361414
26 42722829
27 85445659
28 170891318
29 341782637
30 683565275
31 1367130551
32 2734261102
33 5468522204
34 10937044409

List of values

[1, 2, 5, 10, 20, 40, 81, 162, 325, 651, 1303, 2607, 5215, 10430, 20860, 41721, 83443, 166886, 333772, 667544, 1335088, 2670176, 5340353, 10680707, 21361414, 42722829, 85445659, 170891318, 341782637, 683565275, 1367130551, 2734261102, 5468522204, 10937044409]

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

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