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 | 0 |
| 2 | -3 |
| 3 | -30 |
| 4 | -63 |
| 5 | 12540 |
| 6 | 602877 |
| 7 | 6625710 |
| 8 | -1991169183 |
| 9 | -241970036520 |
| 10 | -7540177734243 |
| 11 | 2917041754949850 |
| 12 | 699983161534169697 |
| 13 | 46722975483964508820 |
| 14 | -21334067257986056115363 |
| 15 | -8882421213380429461235610 |
| 16 | -1081286159351846822872767423 |