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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.

A124507 a(n) = floor(exp(n*Pi/2)).

Table of values

n a(n)
0 1
1 4
2 23
3 111
4 535
5 2575
6 12391
7 59609
8 286751
9 1379410
10 6635623
11 31920519
12 153552935
13 738662922
14 3553321280
15 17093171648
16 82226315585
17 395547831244
18 1902773895292
19 9153250784394
20 44031505860632
21 211812562992413
22 1018919543279304
23 4901489415968642

List of values

[1, 4, 23, 111, 535, 2575, 12391, 59609, 286751, 1379410, 6635623, 31920519, 153552935, 738662922, 3553321280, 17093171648, 82226315585, 395547831244, 1902773895292, 9153250784394, 44031505860632, 211812562992413, 1018919543279304, 4901489415968642]

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

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