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 | 16 |
| 3 | 125 |
| 4 | 758 |
| 5 | 4071 |
| 6 | 20424 |
| 7 | 98185 |
| 8 | 458506 |
| 9 | 2096651 |
| 10 | 9436172 |
| 11 | 41941005 |
| 12 | 184545294 |
| 13 | 805298191 |
| 14 | 3489644560 |
| 15 | 15032352785 |
| 16 | 64424443922 |
| 17 | 274877775891 |
| 18 | 1168230842388 |
| 19 | 4947801800725 |
| 20 | 20890719879190 |
| 21 | 87960928124951 |