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 | 13 |
| 2 | 123 |
| 3 | 665 |
| 4 | 5263 |
| 5 | 37897 |
| 6 | 262707 |
| 7 | 1905471 |
| 8 | 13577504 |
| 9 | 96726819 |
| 10 | 692170604 |
| 11 | 4940333676 |
| 12 | 35278772122 |
| 13 | 252010713334 |
| 14 | 1799646642508 |
| 15 | 12852977396156 |
| 16 | 91796379668972 |
| 17 | 655591261804564 |
| 18 | 4682182568641239 |
| 19 | 33439719466609663 |