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 | 10 |
| 3 | 219 |
| 4 | 8676 |
| 5 | 544505 |
| 6 | 49729758 |
| 7 | 6232661239 |
| 8 | 1026912225160 |
| 9 | 215270320769109 |
| 10 | 55954905981282210 |
| 11 | 17662898483917308083 |
| 12 | 6655958151527584785900 |
| 13 | 2951503248457748982755953 |
| 14 | 1521436331153097968932487206 |
| 15 | 902143190212525713006814917615 |
| 16 | 609729139653483641913607434550800 |