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.
| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 39 |
| 3 | 188 |
| 4 | 1017 |
| 5 | 5800 |
| 6 | 31171 |
| 7 | 171543 |
| 8 | 945046 |
| 9 | 5175491 |
| 10 | 28425138 |
| 11 | 156104665 |
| 12 | 856754888 |
| 13 | 4703782455 |
| 14 | 25823973877 |
| 15 | 141766379306 |
| 16 | 778286514143 |
| 17 | 4272707870336 |
| 18 | 23456587740397 |
| 19 | 128773952953874 |
| 20 | 706953473963971 |