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 | 0 |
| 2 | 2 |
| 3 | 3 |
| 4 | 9 |
| 5 | 19 |
| 6 | 48 |
| 7 | 107 |
| 8 | 258 |
| 9 | 594 |
| 10 | 1405 |
| 11 | 3277 |
| 12 | 7693 |
| 13 | 18004 |
| 14 | 42203 |
| 15 | 98834 |
| 16 | 231592 |
| 17 | 542497 |
| 18 | 1271003 |
| 19 | 2977529 |
| 20 | 6975674 |
| 21 | 16342011 |
| 22 | 38285178 |
| 23 | 89691782 |
| 24 | 210124363 |
| 25 | 492265243 |
| 26 | 1153247379 |
| 27 | 2701752062 |
| 28 | 6329489153 |
| 29 | 14828313076 |
| 30 | 34738805240 |
| 31 | 81383803849 |
| 32 | 190660665579 |
| 33 | 446667359857 |
| 34 | 1046423138962 |