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 | 10 |
| 4 | 39 |
| 5 | 169 |
| 6 | 876 |
| 7 | 4834 |
| 8 | 29316 |
| 9 | 189054 |
| 10 | 1294382 |
| 11 | 9321232 |
| 12 | 70326820 |
| 13 | 553433559 |
| 14 | 4528840412 |
| 15 | 38432156859 |
| 16 | 337454775045 |
| 17 | 3059843449398 |
| 18 | 28602687303185 |
| 19 | 275222034228537 |
| 20 | 2722343346822614 |
| 21 | 27647618196693537 |
| 22 | 287970349621911635 |
| 23 | 3073082817450997700 |
| 24 | 33568654163238906968 |