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) |
|---|---|
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 2 |
| 7 | 2 |
| 8 | 4 |
| 9 | 6 |
| 10 | 11 |
| 11 | 18 |
| 12 | 39 |
| 13 | 70 |
| 14 | 153 |
| 15 | 321 |
| 16 | 721 |
| 17 | 1612 |
| 18 | 3792 |
| 19 | 8896 |
| 20 | 21498 |
| 21 | 52230 |
| 22 | 128994 |
| 23 | 320786 |
| 24 | 806582 |
| 25 | 2040912 |
| 26 | 5205311 |
| 27 | 13352470 |
| 28 | 34460430 |
| 29 | 89384609 |