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 | 6 |
| 2 | 54 |
| 3 | 108 |
| 4 | 810 |
| 5 | 2916 |
| 6 | 20412 |
| 7 | 17496 |
| 8 | 590490 |
| 9 | 78732 |
| 10 | 2598156 |
| 11 | 4251528 |
| 12 | 967222620 |
| 13 | 446410440 |
| 14 | 573956280 |
| 15 | 229582512 |
| 16 | 7317942570 |
| 17 | 23245229340 |
| 18 | 1030538500740 |
| 19 | 65086642152 |