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 | 65 |
| 3 | 536 |
| 4 | 4481 |
| 5 | 37928 |
| 6 | 324545 |
| 7 | 2803256 |
| 8 | 24405761 |
| 9 | 213887048 |
| 10 | 1884629825 |
| 11 | 16679193176 |
| 12 | 148135411841 |
| 13 | 1319377419368 |
| 14 | 11777507763905 |
| 15 | 105319346802296 |
| 16 | 943126559710721 |
| 17 | 8454906106826888 |
| 18 | 75861524447454785 |
| 19 | 681125306429182616 |