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 | 7 |
| 4 | 23 |
| 5 | 83 |
| 6 | 299 |
| 7 | 1107 |
| 8 | 4122 |
| 9 | 15523 |
| 10 | 58769 |
| 11 | 223848 |
| 12 | 856085 |
| 13 | 3286687 |
| 14 | 12656513 |
| 15 | 48871469 |
| 16 | 189145479 |
| 17 | 733547091 |
| 18 | 2849962925 |
| 19 | 11090427510 |
| 20 | 43219527353 |
| 21 | 168645172164 |
| 22 | 658834266936 |
| 23 | 2576566240218 |
| 24 | 10086236606187 |