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 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 13 |
| 6 | 35 |
| 7 | 96 |
| 8 | 267 |
| 9 | 750 |
| 10 | 2123 |
| 11 | 6046 |
| 12 | 17303 |
| 13 | 49721 |
| 14 | 143365 |
| 15 | 414584 |
| 16 | 1201917 |
| 17 | 3492117 |
| 18 | 10165779 |
| 19 | 29643870 |
| 20 | 86574831 |
| 21 | 253188111 |
| 22 | 741365049 |
| 23 | 2173243128 |
| 24 | 6377181825 |
| 25 | 18730782252 |
| 26 | 55062586341 |
| 27 | 161995031226 |
| 28 | 476941691177 |
| 29 | 1405155255055 |