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 | 4 |
| 2 | 25 |
| 3 | 187 |
| 4 | 1552 |
| 5 | 13771 |
| 6 | 127927 |
| 7 | 1228576 |
| 8 | 12099751 |
| 9 | 121538581 |
| 10 | 1240336660 |
| 11 | 12824049277 |
| 12 | 134043231781 |
| 13 | 1414108869268 |
| 14 | 15037450664317 |
| 15 | 161014687970191 |
| 16 | 1734550886346592 |
| 17 | 18785969304551263 |
| 18 | 204432608804093155 |