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 | 3 |
| 2 | 22 |
| 3 | 282 |
| 4 | 5224 |
| 5 | 126120 |
| 6 | 3742704 |
| 7 | 131612432 |
| 8 | 5347866752 |
| 9 | 246490091136 |
| 10 | 12704900911360 |
| 11 | 724072211436288 |
| 12 | 45209213973292032 |
| 13 | 3068872654856532992 |
| 14 | 225023336997933996032 |
| 15 | 17724257054969009940480 |
| 16 | 1492513932494133333753856 |
| 17 | 133800772458366199028023296 |