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 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 3 |
| 7 | 5 |
| 8 | 10 |
| 9 | 20 |
| 10 | 42 |
| 11 | 88 |
| 12 | 189 |
| 13 | 414 |
| 14 | 921 |
| 15 | 2077 |
| 16 | 4737 |
| 17 | 10921 |
| 18 | 25416 |
| 19 | 59646 |
| 20 | 141033 |
| 21 | 335752 |
| 22 | 804258 |
| 23 | 1937372 |
| 24 | 4690989 |
| 25 | 11412140 |
| 26 | 27884328 |
| 27 | 68407056 |
| 28 | 168446547 |
| 29 | 416226830 |
| 30 | 1031816793 |
| 31 | 2565591729 |
| 32 | 6397371713 |
| 33 | 15994440540 |