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) |
|---|---|
| 1 | 1 |
| 2 | -2 |
| 3 | 13 |
| 4 | -248 |
| 5 | 12526 |
| 6 | -1568368 |
| 7 | 466802541 |
| 8 | -321051272000 |
| 9 | 500039245711658 |
| 10 | -1737306124802148608 |
| 11 | 13308275973878544047746 |
| 12 | -222688458529322994469714944 |
| 13 | 8077969377058605224894763722940 |
| 14 | -631225844487016628864332741755017216 |
| 15 | 105685667980009079816649620724931814050429 |