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 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 26 |
| 5 | 115 |
| 6 | 596 |
| 7 | 3623 |
| 8 | 25462 |
| 9 | 203939 |
| 10 | 1836032 |
| 11 | 18361831 |
| 12 | 201984098 |
| 13 | 2423820227 |
| 14 | 31509694204 |
| 15 | 441135811847 |
| 16 | 6617037458606 |
| 17 | 105872600222083 |
| 18 | 1799834206605272 |
| 19 | 32397015728269319 |
| 20 | 615543298868687962 |