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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 10 |
| 5 | 21 |
| 6 | 50 |
| 7 | 99 |
| 8 | 250 |
| 9 | 454 |
| 10 | 1242 |
| 11 | 2223 |
| 12 | 6394 |
| 13 | 11389 |
| 14 | 35002 |
| 15 | 62034 |
| 16 | 202010 |
| 17 | 359483 |
| 18 | 1233518 |
| 19 | 2203507 |
| 20 | 7944100 |
| 21 | 14249715 |
| 22 | 53810836 |
| 23 | 96911168 |
| 24 | 382258438 |
| 25 | 691048071 |
| 26 | 2840120987 |
| 27 | 5152403569 |
| 28 | 22010733048 |
| 29 | 40059670261 |
| 30 | 177444599715 |