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 | 4097 |
| 2 | 535537 |
| 3 | 17308657 |
| 4 | 260917841 |
| 5 | 2420922961 |
| 6 | 16018069537 |
| 7 | 82560763937 |
| 8 | 351149013217 |
| 9 | 1282429536481 |
| 10 | 4138428376721 |
| 11 | 12054528824977 |
| 12 | 32214185570737 |
| 13 | 79991997497777 |
| 14 | 186440250265921 |
| 15 | 411221314601281 |