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 | 4095 |
| 2 | 527345 |
| 3 | 16245775 |
| 4 | 227363409 |
| 5 | 1932641711 |
| 6 | 11664504865 |
| 7 | 54878189535 |
| 8 | 213710059745 |
| 9 | 717570463519 |
| 10 | 2138428376721 |
| 11 | 5777672071535 |
| 12 | 14381984674225 |
| 13 | 33395827252815 |
| 14 | 73052425515329 |
| 15 | 151728638820031 |
| 16 | 301147260519105 |
| 17 | 574209144196415 |