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 | 2 |
| 1 | 8 |
| 2 | 66 |
| 3 | 536 |
| 4 | 4354 |
| 5 | 35368 |
| 6 | 287298 |
| 7 | 2333752 |
| 8 | 18957314 |
| 9 | 153992264 |
| 10 | 1250895426 |
| 11 | 10161155672 |
| 12 | 82540140802 |
| 13 | 670482282088 |
| 14 | 5446398397506 |
| 15 | 44241669462136 |
| 16 | 359379754094594 |
| 17 | 2919279702218888 |
| 18 | 23713617371845698 |
| 19 | 192628218676984472 |
| 20 | 1564739366787721474 |