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 | 11 |
| 4 | 43 |
| 5 | 179 |
| 6 | 778 |
| 7 | 3491 |
| 8 | 16051 |
| 9 | 75235 |
| 10 | 358170 |
| 11 | 1727124 |
| 12 | 8418266 |
| 13 | 41408344 |
| 14 | 205289265 |
| 15 | 1024737905 |
| 16 | 5145933602 |
| 17 | 25978844478 |
| 18 | 131773584768 |
| 19 | 671239285119 |
| 20 | 3432304205872 |
| 21 | 17611565623950 |
| 22 | 90652384728648 |
| 23 | 467963720803022 |
| 24 | 2422110238147351 |