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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.

A347017 a(n) = floor(2^(n-1)) - binomial(n,3) + binomial(n,2) - n + 1.

Table of values

n a(n)
0 1
1 1
2 2
3 4
4 7
5 12
6 22
7 44
8 93
9 200
10 428
11 904
12 1883
13 3876
14 7906
15 16020
16 32313
17 64976
18 130392
19 261328
20 523319
21 1047436
22 2095822
23 4192764
24 8386837
25 16775192
26 33552132
27 67106264
28 134214803
29 268432180
30 536867258
31 1073737764
32 2147479153
33 4294962336
34 8589929136
35 17179863200
36 34359731823

List of values

[1, 1, 2, 4, 7, 12, 22, 44, 93, 200, 428, 904, 1883, 3876, 7906, 16020, 32313, 64976, 130392, 261328, 523319, 1047436, 2095822, 4192764, 8386837, 16775192, 33552132, 67106264, 134214803, 268432180, 536867258, 1073737764, 2147479153, 4294962336, 8589929136, 17179863200, 34359731823]

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

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