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 | 1 |
| 4 | 5 |
| 5 | 29 |
| 6 | 365 |
| 7 | 7565 |
| 8 | 259533 |
| 9 | 16766541 |
| 10 | 1695913805 |
| 11 | 319025518925 |
| 12 | 99428910374221 |
| 13 | 53629954918196557 |
| 14 | 51436455420773021005 |
| 15 | 81633965668282476025165 |
| 16 | 234346782219278654389392717 |
| 17 | 1131832076434284133556933170509 |