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) |
|---|---|
| 1 | 5 |
| 2 | 10 |
| 3 | 17 |
| 4 | 28 |
| 5 | 47 |
| 6 | 82 |
| 7 | 149 |
| 8 | 280 |
| 9 | 539 |
| 10 | 1054 |
| 11 | 2081 |
| 12 | 4132 |
| 13 | 8231 |
| 14 | 16426 |
| 15 | 32813 |
| 16 | 65584 |
| 17 | 131123 |
| 18 | 262198 |
| 19 | 524345 |
| 20 | 1048636 |
| 21 | 2097215 |
| 22 | 4194370 |
| 23 | 8388677 |
| 24 | 16777288 |
| 25 | 33554507 |
| 26 | 67108942 |
| 27 | 134217809 |
| 28 | 268435540 |
| 29 | 536870999 |
| 30 | 1073741914 |
| 31 | 2147483741 |