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 | 14 |
| 3 | 462 |
| 4 | 24024 |
| 5 | 1662804 |
| 6 | 140229804 |
| 7 | 13672405890 |
| 8 | 1489877926680 |
| 9 | 177295473274920 |
| 10 | 22661585038594320 |
| 11 | 3073259571003214320 |
| 12 | 438091463242348309440 |
| 13 | 65166105157299311029200 |
| 14 | 10056663345892631910888600 |
| 15 | 1602608179958939072505281850 |
| 16 | 262708662267696303439658400600 |