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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.

A228138 Number of blocks in a Steiner system S(2, 4, A228137(n+1)).

Table of values

n a(n)
1 4
2 13
3 20
4 50
5 63
6 111
7 130
8 196
9 221
10 305
11 336
12 438
13 475
14 595
15 638
16 776
17 825
18 981
19 1036
20 1210
21 1271
22 1463
23 1530
24 1740
25 1813
26 2041
27 2120
28 2366
29 2451
30 2715
31 2806
32 3088
33 3185
34 3485
35 3588
36 3906
37 4015
38 4351
39 4466
40 4820
41 4941
42 5313
43 5440
44 5830
45 5963
46 6371
47 6510

List of values

[4, 13, 20, 50, 63, 111, 130, 196, 221, 305, 336, 438, 475, 595, 638, 776, 825, 981, 1036, 1210, 1271, 1463, 1530, 1740, 1813, 2041, 2120, 2366, 2451, 2715, 2806, 3088, 3185, 3485, 3588, 3906, 4015, 4351, 4466, 4820, 4941, 5313, 5440, 5830, 5963, 6371, 6510]

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

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