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 | 72 |
| 2 | 5508 |
| 3 | 429624 |
| 4 | 33832890 |
| 5 | 2679564888 |
| 6 | 213025408596 |
| 7 | 16981168285224 |
| 8 | 1356370816782267 |
| 9 | 108509665342581360 |
| 10 | 8691624193940766936 |
| 11 | 696910230823250585232 |
| 12 | 55927046023565859464868 |
| 13 | 4491372003738673637024784 |
| 14 | 360913821729000560118063000 |