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 | 2 |
| 2 | 5 |
| 3 | 16 |
| 4 | 36 |
| 5 | 84 |
| 6 | 273 |
| 7 | 648 |
| 8 | 2114 |
| 9 | 4757 |
| 10 | 16516 |
| 11 | 37161 |
| 12 | 87045 |
| 13 | 282896 |
| 14 | 673924 |
| 15 | 2184233 |
| 16 | 5263877 |
| 17 | 17107472 |
| 18 | 38830244 |
| 19 | 134554132 |
| 20 | 303080705 |
| 21 | 707272770 |
| 22 | 2300725397 |
| 23 | 5457925252 |
| 24 | 17805431433 |
| 25 | 42970665029 |
| 26 | 139654661284 |
| 27 | 314223120404 |
| 28 | 1099646108737 |
| 29 | 2474203744786 |