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 | 8191 |
| 2 | 1586131 |
| 3 | 65514541 |
| 4 | 1153594261 |
| 5 | 11839990891 |
| 6 | 83828316391 |
| 7 | 452866803481 |
| 8 | 1992110014441 |
| 9 | 7458134171671 |
| 10 | 24522712143931 |
| 11 | 72470493235141 |
| 12 | 195881901213181 |
| 13 | 490839666661891 |
| 14 | 1152480295105231 |
| 15 | 2557404559011121 |
| 16 | 5400978405535441 |
| 17 | 10918386832765231 |