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 | 56 |
| 3 | 576 |
| 4 | 6196 |
| 5 | 68406 |
| 6 | 768212 |
| 7 | 8731848 |
| 8 | 100146724 |
| 9 | 1156626990 |
| 10 | 13432735556 |
| 11 | 156713948672 |
| 12 | 1835237017324 |
| 13 | 21560768699762 |
| 14 | 253994850228896 |
| 15 | 2999267652451776 |
| 16 | 35490014668470052 |
| 17 | 420718526924212654 |
| 18 | 4995548847105422048 |
| 19 | 59402743684137281920 |