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 | 41 |
| 3 | 269 |
| 4 | 1937 |
| 5 | 13397 |
| 6 | 94265 |
| 7 | 658397 |
| 8 | 4613153 |
| 9 | 32278949 |
| 10 | 225992009 |
| 11 | 1581825965 |
| 12 | 11073136049 |
| 13 | 77510889461 |
| 14 | 542579414873 |
| 15 | 3798046338173 |
| 16 | 26586353065025 |
| 17 | 186104385361733 |
| 18 | 1302730955812457 |
| 19 | 9119115915846221 |