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 | 8 |
| 2 | 66 |
| 3 | 560 |
| 4 | 4868 |
| 5 | 43168 |
| 6 | 388872 |
| 7 | 3545536 |
| 8 | 32618512 |
| 9 | 302072960 |
| 10 | 2810819616 |
| 11 | 26244590336 |
| 12 | 245642629184 |
| 13 | 2303117466112 |
| 14 | 21620036448384 |
| 15 | 203127300275200 |
| 16 | 1909594544603392 |
| 17 | 17959620096591872 |
| 18 | 168959059780059648 |