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 | 3 |
| 2 | 23 |
| 3 | 294 |
| 4 | 5194 |
| 5 | 116620 |
| 6 | 3175717 |
| 7 | 101696700 |
| 8 | 3745365444 |
| 9 | 155975005998 |
| 10 | 7247927859875 |
| 11 | 371803988506742 |
| 12 | 20870023274690966 |
| 13 | 1272424816703533792 |
| 14 | 83736949788656865729 |
| 15 | 5916106654032037435800 |
| 16 | 446636583718649775483144 |
| 17 | 35882981062654529341219962 |
| 18 | 3056767877633271802374850239 |