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 | 55 |
| 3 | -736 |
| 4 | 13573 |
| 5 | -330058 |
| 6 | 10233219 |
| 7 | -393999940 |
| 8 | 18443289777 |
| 9 | -1031520165710 |
| 10 | 67934648699151 |
| 11 | -5203713576558056 |
| 12 | 458704384454574365 |
| 13 | -46104659405475675026 |
| 14 | 5241286859201262537563 |
| 15 | -669127269362962909934028 |
| 16 | 95322254316544433430632009 |