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 | -1 |
| 2 | 7 |
| 3 | -217 |
| 4 | 27559 |
| 5 | -14082649 |
| 6 | 28827182503 |
| 7 | -236123451882073 |
| 8 | 7737057147819885991 |
| 9 | -1014103817421900276726361 |
| 10 | 531681448124675830384033629607 |
| 11 | -1115016280616112042365706510363949657 |
| 12 | 9353433376690281791373262192784600640357799 |