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 | 4 |
| 3 | 10 |
| 4 | 52 |
| 5 | 196 |
| 6 | 1216 |
| 7 | 5944 |
| 8 | 42400 |
| 9 | 250912 |
| 10 | 2008576 |
| 11 | 13815616 |
| 12 | 122074624 |
| 13 | 950640640 |
| 14 | 9158267392 |
| 15 | 79258479616 |
| 16 | 824644235776 |
| 17 | 7823203807744 |
| 18 | 87245790791680 |
| 19 | 897748312609792 |
| 20 | 10665239974537216 |
| 21 | 118040852776093696 |
| 22 | 1486172381689544704 |
| 23 | 17572063073426206720 |
| 24 | 233446797379437248512 |