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 | 6 |
| 4 | 13 |
| 5 | 28 |
| 6 | 66 |
| 7 | 148 |
| 8 | 349 |
| 9 | 828 |
| 10 | 2004 |
| 11 | 4860 |
| 12 | 11919 |
| 13 | 29280 |
| 14 | 72348 |
| 15 | 179062 |
| 16 | 444357 |
| 17 | 1104030 |
| 18 | 2747476 |
| 19 | 6843910 |
| 20 | 17067229 |
| 21 | 42593112 |
| 22 | 106362575 |
| 23 | 265693836 |
| 24 | 663811498 |
| 25 | 1658352602 |
| 26 | 4141998151 |
| 27 | 10341234170 |
| 28 | 25805349073 |
| 29 | 64352577616 |