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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.

A115792 a(n) = ceiling(g(A000073(n))) with g(k) = (k-1)^2/(4k).

Table of values

n a(n)
2 0
3 0
4 1
5 1
6 2
7 3
8 6
9 11
10 20
11 37
12 69
13 126
14 232
15 426
16 784
17 1442
18 2652
19 4878
20 8973
21 16503
22 30354
23 55829
24 102686
25 188869
26 347384
27 638939
28 1175193
29 2161516
30 3975648
31 7312356
32 13449520
33 24737524
34 45499400
35 83686444
36 153923369
37 283109213
38 520719026
39 957751607

List of values

[0, 0, 1, 1, 2, 3, 6, 11, 20, 37, 69, 126, 232, 426, 784, 1442, 2652, 4878, 8973, 16503, 30354, 55829, 102686, 188869, 347384, 638939, 1175193, 2161516, 3975648, 7312356, 13449520, 24737524, 45499400, 83686444, 153923369, 283109213, 520719026, 957751607]

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

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