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 | 3 |
| 4 | 6 |
| 5 | 13 |
| 6 | 33 |
| 7 | 84 |
| 8 | 205 |
| 9 | 495 |
| 10 | 1206 |
| 11 | 2953 |
| 12 | 7221 |
| 13 | 17628 |
| 14 | 43033 |
| 15 | 105099 |
| 16 | 256710 |
| 17 | 626965 |
| 18 | 1531161 |
| 19 | 3739428 |
| 20 | 9132661 |
| 21 | 22304343 |
| 22 | 54472758 |
| 23 | 133035889 |
| 24 | 324906765 |
| 25 | 793503660 |
| 26 | 1937934241 |
| 27 | 4732918803 |
| 28 | 11558968326 |
| 29 | 28229885533 |