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 | 9 |
| 3 | 259 |
| 4 | 1063 |
| 5 | 136331 |
| 6 | 15259 |
| 7 | 5305837 |
| 8 | 21351973 |
| 9 | 1740485813 |
| 10 | 1745820149 |
| 11 | 2337022458319 |
| 12 | 2341131255319 |
| 13 | 5164765371583843 |
| 14 | 5173292359195843 |
| 15 | 5182536034853059 |
| 16 | 20760610355567611 |
| 17 | 102246457919648504843 |
| 18 | 3789825999242633809 |
| 19 | 26045507479622115279931 |
| 20 | 26064975970269506857723 |