cp's OEIS Frontend

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.

A039823 a(n) = ceiling( (n^2 + n + 2)/4 ).

Table of values

n a(n)
1 1
2 2
3 4
4 6
5 8
6 11
7 15
8 19
9 23
10 28
11 34
12 40
13 46
14 53
15 61
16 69
17 77
18 86
19 96
20 106
21 116
22 127
23 139
24 151
25 163
26 176
27 190
28 204
29 218
30 233
31 249
32 265
33 281
34 298
35 316
36 334
37 352
38 371
39 391
40 411
41 431
42 452
43 474
44 496
45 518
46 541
47 565
48 589
49 613
50 638
51 664
52 690
53 716
54 743
55 771
56 799
57 827

List of values

[1, 2, 4, 6, 8, 11, 15, 19, 23, 28, 34, 40, 46, 53, 61, 69, 77, 86, 96, 106, 116, 127, 139, 151, 163, 176, 190, 204, 218, 233, 249, 265, 281, 298, 316, 334, 352, 371, 391, 411, 431, 452, 474, 496, 518, 541, 565, 589, 613, 638, 664, 690, 716, 743, 771, 799, 827]