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 | 1104 |
| 2 | 170064 |
| 3 | 8662720 |
| 4 | 195082320 |
| 5 | 2319457632 |
| 6 | 17231109824 |
| 7 | 93703589760 |
| 8 | 407488018512 |
| 9 | 1487286966928 |
| 10 | 4744779429216 |
| 11 | 13523760003648 |
| 12 | 35250721087168 |
| 13 | 84944161233120 |
| 14 | 192127452262272 |
| 15 | 409984511707776 |
| 16 | 834658207381584 |
| 17 | 1624411151609760 |
| 18 | 3049176879087248 |
| 19 | 5521413521657280 |