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) |
|---|---|
| 5 | 1 |
| 6 | 1 |
| 7 | 5 |
| 8 | 17 |
| 9 | 57 |
| 10 | 193 |
| 11 | 653 |
| 12 | 2206 |
| 13 | 7431 |
| 14 | 24920 |
| 15 | 83099 |
| 16 | 275334 |
| 17 | 906103 |
| 18 | 2961539 |
| 19 | 9614823 |
| 20 | 31014965 |
| 21 | 99440907 |
| 22 | 317028068 |
| 23 | 1005424803 |
| 24 | 3173208229 |
| 25 | 9970459645 |
| 26 | 31200384655 |
| 27 | 97270715153 |
| 28 | 302217221275 |
| 29 | 936046187573 |
| 30 | 2890888534252 |