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 | 0 |
| 1 | 1 |
| 2 | 8 |
| 3 | 41 |
| 4 | 183 |
| 5 | 770 |
| 6 | 3149 |
| 7 | 12730 |
| 8 | 51209 |
| 9 | 205356 |
| 10 | 822500 |
| 11 | 3292134 |
| 12 | 13172634 |
| 13 | 52698912 |
| 14 | 210812207 |
| 15 | 843281848 |
| 16 | 3373193506 |
| 17 | 13492906143 |
| 18 | 53971888157 |
| 19 | 215888078393 |
| 20 | 863553363881 |
| 21 | 3454215553470 |
| 22 | 13816866413106 |
| 23 | 55267474046659 |