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 | 11 |
| 2 | 103 |
| 3 | 1007 |
| 4 | 10015 |
| 5 | 100031 |
| 6 | 1000063 |
| 7 | 10000127 |
| 8 | 100000255 |
| 9 | 1000000511 |
| 10 | 10000001023 |
| 11 | 100000002047 |
| 12 | 1000000004095 |
| 13 | 10000000008191 |
| 14 | 100000000016383 |
| 15 | 1000000000032767 |
| 16 | 10000000000065535 |
| 17 | 100000000000131071 |