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 | 6 |
| 2 | 438 |
| 3 | 23509 |
| 4 | 1238818 |
| 5 | 65410388 |
| 6 | 3473827027 |
| 7 | 184140417890 |
| 8 | 9756894398324 |
| 9 | 517174361985073 |
| 10 | 27412100990502042 |
| 11 | 1452889626133073024 |
| 12 | 77006768282516987969 |
| 13 | 4081555197498259422846 |
| 14 | 216332403430110823588762 |
| 15 | 11466150014825389043509015 |