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 | 3 |
| 2 | 69 |
| 3 | 3948 |
| 4 | 422082 |
| 5 | 72567522 |
| 6 | 18304992558 |
| 7 | 6367730357160 |
| 8 | 2921446409138136 |
| 9 | 1709074810258369776 |
| 10 | 1241694104839498851552 |
| 11 | 1096850187800368469477424 |
| 12 | 1157691464039682741551221152 |
| 13 | 1438880771284303822650674399664 |