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 | 26 |
| 2 | 350 |
| 3 | 3250 |
| 4 | 23399 |
| 5 | 139204 |
| 6 | 712179 |
| 7 | 3220074 |
| 8 | 13124124 |
| 9 | 48942894 |
| 10 | 168958960 |
| 11 | 544988210 |
| 12 | 1655019795 |
| 13 | 4761697020 |
| 14 | 13048465756 |
| 15 | 34209731996 |
| 16 | 86141195946 |
| 17 | 209025000936 |
| 18 | 490211005011 |
| 19 | 1113996801606 |
| 20 | 2458618650891 |
| 21 | 5280637344216 |