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 | 5 |
| 2 | 43 |
| 3 | 499 |
| 4 | 7193 |
| 5 | 123109 |
| 6 | 2430355 |
| 7 | 54229907 |
| 8 | 1347262321 |
| 9 | 36833528197 |
| 10 | 1097912385851 |
| 11 | 35409316648435 |
| 12 | 1227820993510153 |
| 13 | 45528569866101989 |
| 14 | 1797044836586213923 |
| 15 | 75200136212985945619 |
| 16 | 3324579846014080352225 |
| 17 | 154797474251689486249477 |
| 18 | 7570037033145534341015371 |