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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.

A101687 a(n) = Sum_{k=1..n} floor(binomial(n,k)/k).

Table of values

n a(n)
0 0
1 1
2 2
3 4
4 8
5 14
6 23
7 41
8 73
9 131
10 232
11 418
12 758
13 1388
14 2558
15 4742
16 8837
17 16547
18 31111
19 58705
20 111133
21 210996
22 401645
23 766367
24 1465416
25 2807595
26 5388705
27 10359733
28 19946714
29 38459504
30 74250895
31 143524561
32 277742291
33 538043338
34 1043333607
35 2025040417
36 3933914770

List of values

[0, 1, 2, 4, 8, 14, 23, 41, 73, 131, 232, 418, 758, 1388, 2558, 4742, 8837, 16547, 31111, 58705, 111133, 210996, 401645, 766367, 1465416, 2807595, 5388705, 10359733, 19946714, 38459504, 74250895, 143524561, 277742291, 538043338, 1043333607, 2025040417, 3933914770]

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

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