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 | 29 |
| 2 | 391 |
| 3 | -14761 |
| 4 | -955919 |
| 5 | -1151851 |
| 6 | 2117414071 |
| 7 | 64515005759 |
| 8 | -4798919156639 |
| 9 | -371422676274931 |
| 10 | 8664364972414951 |
| 11 | 1922668627437223079 |
| 12 | 12868783582225461841 |
| 13 | -10009215864276466233211 |
| 14 | -365549644020036472532969 |
| 15 | 52457120268360679565773199 |