cp's OEIS Frontend

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.

A001901 Successive numerators of Wallis's approximation to Pi/2 (reduced).

Table of values

n a(n)
0 1
1 2
2 4
3 16
4 64
5 128
6 256
7 2048
8 16384
9 32768
10 65536
11 262144
12 1048576
13 2097152
14 4194304
15 67108864
16 1073741824
17 2147483648
18 4294967296
19 17179869184
20 68719476736
21 137438953472
22 274877906944
23 2199023255552

List of values

[1, 2, 4, 16, 64, 128, 256, 2048, 16384, 32768, 65536, 262144, 1048576, 2097152, 4194304, 67108864, 1073741824, 2147483648, 4294967296, 17179869184, 68719476736, 137438953472, 274877906944, 2199023255552]

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

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