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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 9 |
| 6 | 20 |
| 7 | 48 |
| 8 | 114 |
| 9 | 284 |
| 10 | 714 |
| 11 | 1829 |
| 12 | 4731 |
| 13 | 12391 |
| 14 | 32711 |
| 15 | 87083 |
| 16 | 233347 |
| 17 | 629132 |
| 18 | 1705026 |
| 19 | 4642964 |
| 20 | 12696279 |
| 21 | 34851400 |
| 22 | 95996673 |
| 23 | 265251812 |
| 24 | 735029389 |
| 25 | 2042187079 |
| 26 | 5687726124 |
| 27 | 15876511622 |
| 28 | 44409196932 |
| 29 | 124459720195 |
| 30 | 349434222059 |
| 31 | 982723600768 |