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 | 2 |
| 3 | 5 |
| 4 | 12 |
| 5 | 37 |
| 6 | 118 |
| 7 | 387 |
| 8 | 1312 |
| 9 | 4445 |
| 10 | 17034 |
| 11 | 73339 |
| 12 | 342532 |
| 13 | 1616721 |
| 14 | 7299100 |
| 15 | 31195418 |
| 16 | 129179184 |
| 17 | 578924785 |
| 18 | 3057167242 |
| 19 | 18723356715 |
| 20 | 120613872016 |
| 21 | 738703713245 |
| 22 | 4080301444740 |
| 23 | 20353638923275 |
| 24 | 95273007634552 |
| 25 | 443132388701107 |
| 26 | 2149933834972928 |