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 | 111 |
| 3 | 2869 |
| 4 | 49534 |
| 5 | 1138331 |
| 6 | 25372284 |
| 7 | 568099880 |
| 8 | 12700233541 |
| 9 | 284202349097 |
| 10 | 6359037680577 |
| 11 | 142285824095768 |
| 12 | 3183697496083230 |
| 13 | 71236519396617958 |
| 14 | 1593945862977398560 |
| 15 | 35665181412067143397 |
| 16 | 798022847623306938661 |