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 | 10 |
| 3 | 34 |
| 4 | 601 |
| 5 | 2089 |
| 6 | 37234 |
| 7 | 129466 |
| 8 | 2307889 |
| 9 | 8024785 |
| 10 | 143051866 |
| 11 | 497407186 |
| 12 | 8866907785 |
| 13 | 30831220729 |
| 14 | 549605230786 |
| 15 | 1911038277994 |
| 16 | 34066657400929 |
| 17 | 118453542014881 |
| 18 | 2111583153626794 |
| 19 | 7342208566644610 |
| 20 | 130884088867460281 |
| 21 | 455098477589950921 |