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 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 9 |
| 5 | 17 |
| 6 | 41 |
| 7 | 85 |
| 8 | 177 |
| 9 | 385 |
| 10 | 817 |
| 11 | 1733 |
| 12 | 3705 |
| 13 | 7889 |
| 14 | 16793 |
| 15 | 35797 |
| 16 | 76257 |
| 17 | 162433 |
| 18 | 346081 |
| 19 | 737285 |
| 20 | 1570665 |
| 21 | 3346193 |
| 22 | 7128713 |
| 23 | 15186901 |
| 24 | 32354193 |
| 25 | 68927233 |
| 26 | 146842129 |
| 27 | 312831941 |
| 28 | 666455769 |
| 29 | 1419814097 |
| 30 | 3024765689 |
| 31 | 6443947093 |