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 | 15 |
| 2 | 1185 |
| 3 | 230895 |
| 4 | 83860545 |
| 5 | 48942778575 |
| 6 | 41893214676705 |
| 7 | 49441928730798255 |
| 8 | 76946148390480577665 |
| 9 | 152682246738275154625935 |
| 10 | 376229085883258481118811425 |
| 11 | 1127131459348047116845576437615 |
| 12 | 4034538627668651235506091915425985 |