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 | 1 |
| 3 | 4 |
| 4 | 10 |
| 5 | 23 |
| 6 | 53 |
| 7 | 123 |
| 8 | 286 |
| 9 | 665 |
| 10 | 1546 |
| 11 | 3594 |
| 12 | 8355 |
| 13 | 19423 |
| 14 | 45153 |
| 15 | 104968 |
| 16 | 244021 |
| 17 | 567280 |
| 18 | 1318766 |
| 19 | 3065759 |
| 20 | 7127025 |
| 21 | 16568323 |
| 22 | 38516678 |
| 23 | 89540413 |
| 24 | 208156206 |
| 25 | 483904470 |
| 26 | 1124941411 |
| 27 | 2615171499 |
| 28 | 6079536145 |
| 29 | 14133206848 |
| 30 | 32855719753 |