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 | 2 |
| 2 | 3 |
| 3 | 5 |
| 4 | 11 |
| 5 | 19 |
| 6 | 29 |
| 7 | 163 |
| 8 | 281 |
| 9 | 881 |
| 10 | 209441 |
| 11 | 264539521 |
| 12 | 72642169601 |
| 13 | 9927882482918401 |
| 14 | 26582634158080001 |
| 15 | 141383412854531380076544001 |
| 16 | 427380210218181008588800001 |
| 17 | 2295148179742698933452800001 |
| 18 | 191433282535027132859721811688265047080960000001 |