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 | 3 |
| 2 | 8 |
| 3 | 19 |
| 4 | 45 |
| 5 | 102 |
| 6 | 232 |
| 7 | 524 |
| 8 | 1181 |
| 9 | 2659 |
| 10 | 5984 |
| 11 | 13466 |
| 12 | 30300 |
| 13 | 68177 |
| 14 | 153400 |
| 15 | 345151 |
| 16 | 776590 |
| 17 | 1747330 |
| 18 | 3931495 |
| 19 | 8845865 |
| 20 | 19903197 |
| 21 | 44782195 |
| 22 | 100759939 |
| 23 | 226709865 |
| 24 | 510097199 |
| 25 | 1147718699 |
| 26 | 2582367075 |
| 27 | 5810325919 |
| 28 | 13073233320 |
| 29 | 29414774972 |
| 30 | 66183243689 |
| 31 | 148912298302 |