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 | 255 |
| 2 | 1733 |
| 3 | 10720 |
| 4 | 71313 |
| 5 | 451481 |
| 6 | 2964676 |
| 7 | 18970267 |
| 8 | 123694345 |
| 9 | 795726064 |
| 10 | 5169185873 |
| 11 | 33344636925 |
| 12 | 216190905756 |
| 13 | 1396553927379 |
| 14 | 9045384191389 |
| 15 | 58474650871712 |
| 16 | 378535391931953 |
| 17 | 2448013308032361 |
| 18 | 15842822807262836 |