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 | 2 |
| 3 | 6 |
| 4 | 13 |
| 5 | 30 |
| 6 | 66 |
| 7 | 144 |
| 8 | 308 |
| 9 | 655 |
| 10 | 1380 |
| 11 | 2891 |
| 12 | 6024 |
| 13 | 12500 |
| 14 | 25844 |
| 15 | 53274 |
| 16 | 109530 |
| 17 | 224690 |
| 18 | 460033 |
| 19 | 940276 |
| 20 | 1918979 |
| 21 | 3911186 |
| 22 | 7962194 |
| 23 | 16191875 |
| 24 | 32896364 |
| 25 | 66776727 |
| 26 | 135445212 |
| 27 | 274532607 |
| 28 | 556086916 |
| 29 | 1125727954 |
| 30 | 2277650681 |
| 31 | 4605981879 |
| 32 | 9310120876 |
| 33 | 18810538092 |