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 | 9 |
| 3 | 10 |
| 4 | 29 |
| 5 | 262 |
| 6 | 954 |
| 7 | 2590 |
| 8 | 2662 |
| 9 | 9534 |
| 10 | 25862 |
| 11 | 26662 |
| 12 | 82865 |
| 13 | 95334 |
| 14 | 104262 |
| 15 | 266662 |
| 16 | 298514 |
| 17 | 2666662 |
| 18 | 10338610 |
| 19 | 26666662 |
| 20 | 30151462 |
| 21 | 103493337 |
| 22 | 266290989 |
| 23 | 266666662 |
| 24 | 1043584537 |
| 25 | 2666666662 |
| 26 | 3302531009 |
| 27 | 10531233862 |
| 28 | 26288192537 |