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 | 2 |
| 2 | 9 |
| 3 | 68 |
| 4 | 750 |
| 5 | 11178 |
| 6 | 213895 |
| 7 | 5068102 |
| 8 | 144746329 |
| 9 | 4880572564 |
| 10 | 191104219619 |
| 11 | 8573780527428 |
| 12 | 435844228476008 |
| 13 | 24868815362420244 |
| 14 | 1579939008182007447 |
| 15 | 110981916769308996238 |
| 16 | 8567134375799509782211 |