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 | 3 |
| 1 | 8 |
| 2 | 26 |
| 3 | 92 |
| 4 | 338 |
| 5 | 1268 |
| 6 | 4826 |
| 7 | 18572 |
| 8 | 72098 |
| 9 | 281828 |
| 10 | 1107626 |
| 11 | 4371452 |
| 12 | 17308658 |
| 13 | 68703188 |
| 14 | 273218426 |
| 15 | 1088090732 |
| 16 | 4338014018 |
| 17 | 17309009348 |
| 18 | 69106897226 |
| 19 | 276040168412 |
| 20 | 1102998412178 |
| 21 | 4408506864308 |
| 22 | 17623567104026 |