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 | 3 |
| 3 | 11 |
| 4 | 42 |
| 5 | 165 |
| 6 | 654 |
| 7 | 2605 |
| 8 | 10398 |
| 9 | 41550 |
| 10 | 166116 |
| 11 | 664299 |
| 12 | 2656866 |
| 13 | 10626810 |
| 14 | 42505932 |
| 15 | 170021123 |
| 16 | 680079282 |
| 17 | 2720306730 |
| 18 | 10881206124 |
| 19 | 43524782946 |
| 20 | 174099048684 |
| 21 | 696396028620 |
| 22 | 2785583782248 |
| 23 | 11142334464693 |
| 24 | 44569336530174 |
| 25 | 178277343463830 |
| 26 | 713109368541588 |