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 | 408 |
| 2 | 28872 |
| 3 | -2685984 |
| 4 | 24039336 |
| 5 | 776610576 |
| 6 | -657274464 |
| 7 | -112765274688 |
| 8 | -1315204139160 |
| 9 | -9184174537416 |
| 10 | -47705529895632 |
| 11 | -201727238619744 |
| 12 | -730623451715808 |
| 13 | -2340991131399984 |
| 14 | -6787572064867008 |
| 15 | -18105120840067776 |
| 16 | -44991518932447512 |
| 17 | -105189400371536208 |
| 18 | -233200610257765464 |