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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.

A194161 a(n) = [Sum_{k=1..n} (k*r)], where [ ]=floor, ( )=fractional part, and r=sqrt(2).

Table of values

n a(n)
1 0
2 1
3 1
4 2
5 2
6 2
7 3
8 3
9 4
10 4
11 5
12 6
13 6
14 7
15 7
16 8
17 8
18 8
19 9
20 9
21 10
22 10
23 11
24 12
25 12
26 13
27 13
28 14
29 14
30 14
31 15
32 15
33 16
34 16
35 16
36 17
37 18
38 18
39 19
40 19
41 20
42 21
43 21
44 22
45 22
46 22
47 23
48 24
49 24
50 25
51 25
52 25
53 26
54 27
55 27
56 28
57 28
58 28
59 29
60 30
61 30
62 30
63 31
64 31
65 32
66 32
67 33
68 33
69 34
70 35
71 35
72 36
73 36

List of values

[0, 1, 1, 2, 2, 2, 3, 3, 4, 4, 5, 6, 6, 7, 7, 8, 8, 8, 9, 9, 10, 10, 11, 12, 12, 13, 13, 14, 14, 14, 15, 15, 16, 16, 16, 17, 18, 18, 19, 19, 20, 21, 21, 22, 22, 22, 23, 24, 24, 25, 25, 25, 26, 27, 27, 28, 28, 28, 29, 30, 30, 30, 31, 31, 32, 32, 33, 33, 34, 35, 35, 36, 36]

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

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