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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.

A047164 Number of nonempty subsets of {1,2,...,n} in which exactly 3/4 of the elements are <= n/2.

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 0
6 3
7 4
8 16
9 20
10 50
11 60
12 135
13 161
14 392
15 476
16 1232
17 1512
18 3864
19 4740
20 11850
21 14520
22 36300
23 44572
24 112519
25 138567
26 351351
27 433433
28 1098188
29 1355900
30 3433703
31 4243148
32 10758608
33 13308416
34 33794504
35 41843256
36 106344792
37 131772372
38 335061789
39 415445184
40 1056924666

List of values

[0, 0, 0, 0, 0, 3, 4, 16, 20, 50, 60, 135, 161, 392, 476, 1232, 1512, 3864, 4740, 11850, 14520, 36300, 44572, 112519, 138567, 351351, 433433, 1098188, 1355900, 3433703, 4243148, 10758608, 13308416, 33794504, 41843256, 106344792, 131772372, 335061789, 415445184, 1056924666]

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

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