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 | 1 |
| 2 | 4 |
| 3 | 12 |
| 4 | 34 |
| 5 | 92 |
| 6 | 246 |
| 7 | 640 |
| 8 | 1660 |
| 9 | 4264 |
| 10 | 10914 |
| 11 | 27732 |
| 12 | 70247 |
| 13 | 177466 |
| 14 | 447570 |
| 15 | 1126344 |
| 16 | 2828465 |
| 17 | 7089391 |
| 18 | 17746456 |
| 19 | 44384884 |
| 20 | 110927184 |
| 21 | 276993616 |
| 22 | 691007612 |
| 23 | 1722214602 |
| 24 | 4289021667 |
| 25 | 10675557184 |
| 26 | 26561494820 |
| 27 | 66063726382 |
| 28 | 164248795485 |
| 29 | 408168287028 |
| 30 | 1013819012498 |