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 | 0 |
| 2 | 3 |
| 3 | 33 |
| 4 | 360 |
| 5 | 3927 |
| 6 | 42837 |
| 7 | 467280 |
| 8 | 5097243 |
| 9 | 55602393 |
| 10 | 606529080 |
| 11 | 6616217487 |
| 12 | 72171863277 |
| 13 | 787274278560 |
| 14 | 8587845200883 |
| 15 | 93679022931153 |
| 16 | 1021881407041800 |
| 17 | 11147016454528647 |
| 18 | 121595299592773317 |