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 | 1 |
| 2 | 7 |
| 3 | 16 |
| 4 | 46 |
| 5 | 97 |
| 6 | 271 |
| 7 | 568 |
| 8 | 1582 |
| 9 | 3313 |
| 10 | 9223 |
| 11 | 19312 |
| 12 | 53758 |
| 13 | 112561 |
| 14 | 313327 |
| 15 | 656056 |
| 16 | 1826206 |
| 17 | 3823777 |
| 18 | 10643911 |
| 19 | 22286608 |
| 20 | 62037262 |
| 21 | 129895873 |
| 22 | 361579663 |
| 23 | 757088632 |
| 24 | 2107440718 |
| 25 | 4412635921 |
| 26 | 12283064647 |
| 27 | 25718726896 |
| 28 | 71590947166 |
| 29 | 149899725457 |
| 30 | 417262618351 |