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 | 1 |
| 2 | 4 |
| 3 | 8 |
| 4 | 26 |
| 5 | 60 |
| 6 | 184 |
| 7 | 488 |
| 8 | 1509 |
| 9 | 4468 |
| 10 | 14494 |
| 11 | 47228 |
| 12 | 163584 |
| 13 | 580489 |
| 14 | 2155219 |
| 15 | 8245929 |
| 16 | 32708045 |
| 17 | 133615420 |
| 18 | 562518913 |
| 19 | 2432472970 |
| 20 | 10794454457 |
| 21 | 49060744260 |
| 22 | 228113422904 |
| 23 | 1083584062308 |
| 24 | 5253168117841 |
| 25 | 25964917671574 |
| 26 | 130732997627332 |
| 27 | 669989546176410 |
| 28 | 3492408687398352 |