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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 6 |
| 5 | 9 |
| 6 | 10 |
| 7 | 18 |
| 8 | 30 |
| 9 | 90 |
| 10 | 123 |
| 11 | 730 |
| 12 | 7086 |
| 13 | 172426 |
| 14 | 300243 |
| 15 | 372390 |
| 16 | 449674 |
| 17 | 1812298 |
| 18 | 5027914 |
| 19 | 5307130 |
| 20 | 17214354 |
| 21 | 20788426 |
| 22 | 84929451 |
| 23 | 101992426 |
| 24 | 102177370 |
| 25 | 103544442 |
| 26 | 106494770 |
| 27 | 161388338 |
| 28 | 181327546 |
| 29 | 193710249 |
| 30 | 207083626 |