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 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 46 |
| 6 | 162 |
| 7 | 641 |
| 8 | 2656 |
| 9 | 12092 |
| 10 | 56956 |
| 11 | 290636 |
| 12 | 1523088 |
| 13 | 8559980 |
| 14 | 49163792 |
| 15 | 300514337 |
| 16 | 1870652672 |
| 17 | 12318376190 |
| 18 | 82394305842 |
| 19 | 580168452664 |
| 20 | 4141242464512 |
| 21 | 30992978322024 |
| 22 | 234765130286990 |
| 23 | 1858132080028884 |