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 | 7 |
| 1 | 71 |
| 2 | 768 |
| 3 | 8920 |
| 4 | 109232 |
| 5 | 1390800 |
| 6 | 18237952 |
| 7 | 244701440 |
| 8 | 3343713024 |
| 9 | 46374830848 |
| 10 | 651170275328 |
| 11 | 9238908291072 |
| 12 | 132251092529152 |
| 13 | 1907671386263552 |
| 14 | 27701755840561152 |
| 15 | 404632598092447744 |