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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 13 |
| 5 | 34 |
| 6 | 133 |
| 7 | 115 |
| 8 | 435 |
| 9 | 59334 |
| 10 | 2294 |
| 11 | 19721 |
| 12 | 195693 |
| 13 | 4060189 |
| 14 | 12746447 |
| 15 | 331303 |
| 16 | 25369351 |
| 17 | 4959422 |
| 18 | 11092118 |
| 19 | 28745223797 |
| 20 | 16310849170 |
| 21 | 14814154260 |
| 22 | 348379527681 |
| 23 | 263145320733 |
| 24 | 1493627665569 |
| 25 | 100023828627 |
| 26 | 531705615333 |
| 27 | 156537259557 |
| 28 | 1047443521637 |