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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.

A366659 a(n) = Sum_{k=1..n} (-1)^(k-1) * binomial(floor(n/k)+3,4).

Table of values

n a(n)
1 1
2 4
3 15
4 30
5 66
6 115
7 200
8 295
9 471
10 659
11 946
12 1259
13 1715
14 2194
15 2920
16 3591
17 4561
18 5585
19 6916
20 8216
21 10082
22 11823
23 14124
24 16389
25 19350
26 22174
27 26004
28 29435
29 33931
30 38445
31 43902
32 48925
33 55767
34 61941
35 69831
36 77275
37 86415
38 94968
39 106094
40 115874
41 128216
42 140214
43 154405

List of values

[1, 4, 15, 30, 66, 115, 200, 295, 471, 659, 946, 1259, 1715, 2194, 2920, 3591, 4561, 5585, 6916, 8216, 10082, 11823, 14124, 16389, 19350, 22174, 26004, 29435, 33931, 38445, 43902, 48925, 55767, 61941, 69831, 77275, 86415, 94968, 106094, 115874, 128216, 140214, 154405]

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

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