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 | 16 |
| 2 | 256 |
| 3 | 2527 |
| 4 | 18980 |
| 5 | 136289 |
| 6 | 1023339 |
| 7 | 8052573 |
| 8 | 64796052 |
| 9 | 523162622 |
| 10 | 4210122961 |
| 11 | 33781534586 |
| 12 | 270773273163 |
| 13 | 2170507336531 |
| 14 | 17404421705191 |
| 15 | 139588544598990 |
| 16 | 1119608454999432 |
| 17 | 8980016929917601 |
| 18 | 72024132676487746 |
| 19 | 577661751732689211 |