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 | 3 |
| 3 | 8 |
| 4 | 23 |
| 5 | 69 |
| 6 | 208 |
| 7 | 636 |
| 8 | 1963 |
| 9 | 6099 |
| 10 | 19059 |
| 11 | 59836 |
| 12 | 188576 |
| 13 | 596252 |
| 14 | 1890548 |
| 15 | 6008908 |
| 16 | 19139155 |
| 17 | 61074583 |
| 18 | 195217253 |
| 19 | 624913284 |
| 20 | 2003090071 |
| 21 | 6428430129 |
| 22 | 20653101216 |
| 23 | 66420162952 |
| 24 | 213802390264 |
| 25 | 688796847976 |
| 26 | 2220789746752 |
| 27 | 7165331870036 |