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 | 2 |
| 2 | 3 |
| 3 | 6 |
| 4 | 14 |
| 5 | 36 |
| 6 | 94 |
| 7 | 250 |
| 8 | 675 |
| 9 | 1832 |
| 10 | 5005 |
| 11 | 13746 |
| 12 | 37901 |
| 13 | 104902 |
| 14 | 291312 |
| 15 | 811346 |
| 16 | 2265905 |
| 17 | 6343854 |
| 18 | 17801383 |
| 19 | 50057400 |
| 20 | 141034248 |
| 21 | 398070362 |
| 22 | 1125426581 |
| 23 | 3186725646 |
| 24 | 9036406687 |
| 25 | 25658313188 |
| 26 | 72946289247 |
| 27 | 207628101578 |
| 28 | 591622990214 |
| 29 | 1687527542874 |
| 30 | 4818113792640 |