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 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 6 |
| 6 | 17 |
| 7 | 41 |
| 8 | 116 |
| 9 | 313 |
| 10 | 895 |
| 11 | 2550 |
| 12 | 7450 |
| 13 | 21881 |
| 14 | 65168 |
| 15 | 195370 |
| 16 | 591007 |
| 17 | 1798718 |
| 18 | 5510023 |
| 19 | 16966529 |
| 20 | 52506837 |
| 21 | 163200904 |
| 22 | 509323732 |
| 23 | 1595311747 |
| 24 | 5013746254 |
| 25 | 15805787496 |
| 26 | 49969942138 |
| 27 | 158396065350 |
| 28 | 503317495573 |
| 29 | 1602973785463 |
| 30 | 5116010587910 |
| 31 | 16360492172347 |