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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 121 |
| 6 | 130 |
| 7 | 203 |
| 8 | 316 |
| 9 | 8578 |
| 10 | 9490 |
| 11 | 17492 |
| 12 | 944035 |
| 13 | 1141652 |
| 14 | 1276916 |
| 15 | 1554173 |
| 16 | 58961443 |
| 17 | 67470916 |
| 18 | 4099065139 |
| 19 | 5691134677 |
| 20 | 81452592329 |
| 21 | 81473867465 |
| 22 | 419572845958 |
| 23 | 21056462595764 |
| 24 | 363376288168081 |