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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.

A248347 a(n) = floor(1/(Pi - 2^(n+1)*sin(Pi/2^(n+1)))).

Table of values

n a(n)
1 3
2 12
3 49
4 198
5 792
6 3170
7 12681
8 50727
9 202909
10 811636
11 3246545
12 12986183
13 51944732
14 207778928
15 831115713
16 3324462855
17 13297851421
18 53191405684
19 212765622737
20 851062490950
21 3404249963800
22 13616999855201
23 54467999420806
24 217871997683226
25 871487990732903

List of values

[3, 12, 49, 198, 792, 3170, 12681, 50727, 202909, 811636, 3246545, 12986183, 51944732, 207778928, 831115713, 3324462855, 13297851421, 53191405684, 212765622737, 851062490950, 3404249963800, 13616999855201, 54467999420806, 217871997683226, 871487990732903]

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

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