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 | 9 |
| 2 | 58 |
| 3 | 344 |
| 4 | 1867 |
| 5 | 9389 |
| 6 | 43774 |
| 7 | 191433 |
| 8 | 793049 |
| 9 | 3134307 |
| 10 | 11887373 |
| 11 | 43482354 |
| 12 | 154000286 |
| 13 | 529571812 |
| 14 | 1771709727 |
| 15 | 5775999764 |
| 16 | 18376959165 |
| 17 | 57141981155 |
| 18 | 173888869424 |
| 19 | 518545311255 |
| 20 | 1517106917098 |
| 21 | 4359360903570 |
| 22 | 12314479965763 |