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 | 0 |
| 2 | 6 |
| 3 | 27 |
| 4 | 324 |
| 5 | 3645 |
| 6 | 54918 |
| 7 | 923643 |
| 8 | 18061704 |
| 9 | 394663833 |
| 10 | 9607469130 |
| 11 | 256997250279 |
| 12 | 7502660832780 |
| 13 | 237243300445125 |
| 14 | 8079508278302958 |
| 15 | 294800526215739315 |
| 16 | 11473728720705019152 |
| 17 | 474469344621574172721 |
| 18 | 20774758472643152149650 |