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 | -11 |
| 2 | 169 |
| 3 | -132 |
| 4 | 3331 |
| 5 | -2068 |
| 6 | 293833 |
| 7 | -24332 |
| 8 | 587731 |
| 9 | -349668 |
| 10 | 25505309 |
| 11 | 552068 |
| 12 | 33090480121 |
| 13 | -410134868 |
| 14 | -33892394081 |
| 15 | 49596274068 |
| 16 | 89416179798227 |
| 17 | -8608525769668 |
| 18 | -135370368690226973 |
| 19 | 1863571109045668 |
| 20 | 2694387099249512441 |
| 21 | -495661781956150068 |
| 22 | -1648223983059638297863 |