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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.

A357356 Number of nonempty subsets of {1..n} whose elements have an even average.

Table of values

n a(n)
1 0
2 1
3 3
4 4
5 6
6 13
7 25
8 38
9 64
10 119
11 219
12 384
13 686
14 1285
15 2405
16 4428
17 8236
18 15569
19 29463
20 55582
21 105326
22 200847
23 383609
24 732744
25 1403004
26 2694391
27 5181663
28 9973416
29 19226166
30 37125547
31 71770069
32 138871244
33 269005540
34 521666967
35 1012555015
36 1966957674
37 3824166974

List of values

[0, 1, 3, 4, 6, 13, 25, 38, 64, 119, 219, 384, 686, 1285, 2405, 4428, 8236, 15569, 29463, 55582, 105326, 200847, 383609, 732744, 1403004, 2694391, 5181663, 9973416, 19226166, 37125547, 71770069, 138871244, 269005540, 521666967, 1012555015, 1966957674, 3824166974]

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

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