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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 10 |
| 5 | 38 |
| 6 | 82 |
| 7 | 91 |
| 8 | 730 |
| 9 | 6562 |
| 10 | 6643 |
| 11 | 59050 |
| 12 | 531442 |
| 13 | 532171 |
| 14 | 4782970 |
| 15 | 43046722 |
| 16 | 43053283 |
| 17 | 387420490 |
| 18 | 3486784402 |
| 19 | 3486843451 |
| 20 | 31381059610 |