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 | 2 |
| 2 | 3 |
| 3 | 5 |
| 4 | 23 |
| 5 | 51 |
| 6 | 227 |
| 7 | 1640 |
| 8 | 1867 |
| 9 | 9108 |
| 10 | 20083 |
| 11 | 69357 |
| 12 | 297511 |
| 13 | 3044467 |
| 14 | 3341978 |
| 15 | 9728423 |
| 16 | 13070401 |
| 17 | 22798824 |
| 18 | 35869225 |
| 19 | 560837199 |
| 20 | 596706424 |
| 21 | 2350956471 |
| 22 | 14702445250 |