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 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 5 |
| 4 | -650 |
| 5 | -46071 |
| 6 | 3121776 |
| 7 | 5538166381 |
| 8 | 3146076001776 |
| 9 | -10459815889305231 |
| 10 | -100694615309371571840 |
| 11 | -193538025548431984737219 |
| 12 | 38912028315765820944424730112 |
| 13 | 2554132880645627969533690819801657 |
| 14 | -106074951996903194289368162206783509504 |