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 | 4 |
| 4 | 37 |
| 5 | 154 |
| 6 | 1072 |
| 7 | 5320 |
| 8 | 32675 |
| 9 | 175294 |
| 10 | 1024028 |
| 11 | 5668692 |
| 12 | 32463802 |
| 13 | 181971848 |
| 14 | 1033917350 |
| 15 | 5824476298 |
| 16 | 32989068162 |
| 17 | 186210666468 |
| 18 | 1053349394128 |
| 19 | 5950467515104 |
| 20 | 33643541208290 |
| 21 | 190115484271760 |
| 22 | 1074685815276400 |
| 23 | 6073680777522430 |
| 24 | 34330607094625734 |