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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 30 |
| 5 | 104 |
| 6 | 378 |
| 7 | 1414 |
| 8 | 5424 |
| 9 | 21208 |
| 10 | 84244 |
| 11 | 339008 |
| 12 | 1379173 |
| 13 | 5663078 |
| 14 | 23439651 |
| 15 | 97692524 |
| 16 | 409650348 |
| 17 | 1727034770 |
| 18 | 7315915371 |
| 19 | 31124324364 |
| 20 | 132926220818 |
| 21 | 569695276362 |
| 22 | 2449395461726 |
| 23 | 10561857055472 |
| 24 | 45664873651576 |