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 | 191 |
| 1 | 1471 |
| 2 | 7551 |
| 3 | 31871 |
| 4 | 119231 |
| 5 | 410303 |
| 6 | 1327103 |
| 7 | 4090623 |
| 8 | 12130303 |
| 9 | 34842623 |
| 10 | 97435647 |
| 11 | 266313727 |
| 12 | 713637887 |
| 13 | 1879523327 |
| 14 | 4875091967 |
| 15 | 12474187775 |
| 16 | 31531728895 |
| 17 | 78832992255 |
| 18 | 195135799295 |
| 19 | 478649778175 |
| 20 | 1164351373311 |