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 | 13 |
| 2 | -281 |
| 3 | -15353 |
| 4 | 179761 |
| 5 | 29972293 |
| 6 | -14822441 |
| 7 | -81117882833 |
| 8 | -1007841787679 |
| 9 | 278922434958973 |
| 10 | 7707750894566599 |
| 11 | -1154950195686012713 |
| 12 | -53167719472022830319 |
| 13 | 5545550703568171856053 |
| 14 | 383123318057719791494839 |
| 15 | -29956366297729125403700993 |