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 | 6 |
| 4 | 23 |
| 5 | 102 |
| 6 | 492 |
| 7 | 2492 |
| 8 | 13003 |
| 9 | 69172 |
| 10 | 372963 |
| 11 | 2031174 |
| 12 | 11148948 |
| 13 | 61588814 |
| 14 | 342068774 |
| 15 | 1908740089 |
| 16 | 10694374242 |
| 17 | 60137305751 |
| 18 | 339276548456 |
| 19 | 1919787554118 |
| 20 | 10892575241125 |
| 21 | 61957028188350 |
| 22 | 353224194632459 |
| 23 | 2018076850631391 |
| 24 | 11552829351121139 |
| 25 | 66259093178740462 |