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 | 48 |
| 2 | 1104 |
| 3 | 16192 |
| 4 | 170064 |
| 5 | 1362336 |
| 6 | 8662720 |
| 7 | 44981376 |
| 8 | 195082320 |
| 9 | 721175536 |
| 10 | 2319457632 |
| 11 | 6631997376 |
| 12 | 17231109824 |
| 13 | 41469483552 |
| 14 | 93703589760 |
| 15 | 200343312768 |
| 16 | 407488018512 |
| 17 | 793229226336 |
| 18 | 1487286966928 |
| 19 | 2697825744960 |
| 20 | 4744779429216 |