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 | 1 |
| 2 | 5 |
| 3 | 29 |
| 4 | 174 |
| 5 | 1068 |
| 6 | 6655 |
| 7 | 41926 |
| 8 | 266338 |
| 9 | 1703027 |
| 10 | 10947079 |
| 11 | 70673825 |
| 12 | 457927079 |
| 13 | 2976282415 |
| 14 | 19395654894 |
| 15 | 126688273871 |
| 16 | 829176461458 |
| 17 | 5436687172806 |
| 18 | 35703722618623 |
| 19 | 234807844921153 |
| 20 | 1546217013188447 |
| 21 | 10193761267335877 |
| 22 | 67275841673522196 |
| 23 | 444431529264364506 |