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 | 2 |
| 3 | 8 |
| 4 | 32 |
| 5 | 122 |
| 6 | 462 |
| 7 | 1758 |
| 8 | 6718 |
| 9 | 25750 |
| 10 | 98956 |
| 11 | 381196 |
| 12 | 1471678 |
| 13 | 5693146 |
| 14 | 22064296 |
| 15 | 85655812 |
| 16 | 333035302 |
| 17 | 1296684130 |
| 18 | 5055195944 |
| 19 | 19731318068 |
| 20 | 77098776372 |
| 21 | 301561031472 |
| 22 | 1180608808044 |
| 23 | 4626045139116 |
| 24 | 18140934734434 |
| 25 | 71191952221114 |
| 26 | 279576978531644 |