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 | 17 |
| 2 | 133 |
| 3 | 857 |
| 4 | 6413 |
| 5 | 48867 |
| 6 | 381313 |
| 7 | 3016163 |
| 8 | 24107789 |
| 9 | 194175677 |
| 10 | 1573174523 |
| 11 | 12802874695 |
| 12 | 104553143825 |
| 13 | 856091328837 |
| 14 | 7024086050415 |
| 15 | 57721845597987 |
| 16 | 474910998928093 |
| 17 | 3910960204957435 |
| 18 | 32229946522723645 |
| 19 | 265747140536421765 |