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) |
|---|---|
| 1 | 27 |
| 2 | 336 |
| 3 | 2016 |
| 4 | 11664 |
| 5 | 63792 |
| 6 | 339480 |
| 7 | 1770048 |
| 8 | 9084744 |
| 9 | 46050480 |
| 10 | 231090264 |
| 11 | 1150053408 |
| 12 | 5683587048 |
| 13 | 27921925008 |
| 14 | 136471932792 |
| 15 | 664055030016 |
| 16 | 3218568401160 |
| 17 | 15545839096944 |
| 18 | 74855120204952 |
| 19 | 359437016141280 |