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 | 2 |
| 2 | 14 |
| 3 | 76 |
| 4 | 378 |
| 5 | 1808 |
| 6 | 8484 |
| 7 | 39446 |
| 8 | 182732 |
| 9 | 846248 |
| 10 | 3926338 |
| 11 | 18276832 |
| 12 | 85436832 |
| 13 | 401313288 |
| 14 | 1894847846 |
| 15 | 8994916236 |
| 16 | 42931067910 |
| 17 | 206002472336 |
| 18 | 993664391720 |
| 19 | 4817140123620 |
| 20 | 23464959242520 |
| 21 | 114820471485840 |
| 22 | 564248307992850 |
| 23 | 2783898831160512 |
| 24 | 13786409317705920 |
| 25 | 68509284536815640 |
| 26 | 341538385855855064 |
| 27 | 1707729163812908528 |