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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 10 |
| 6 | 23 |
| 7 | 52 |
| 8 | 120 |
| 9 | 275 |
| 10 | 644 |
| 11 | 1508 |
| 12 | 3558 |
| 13 | 8418 |
| 14 | 20012 |
| 15 | 47699 |
| 16 | 114082 |
| 17 | 273476 |
| 18 | 657250 |
| 19 | 1582817 |
| 20 | 3819514 |
| 21 | 9233059 |
| 22 | 22356918 |
| 23 | 54216429 |
| 24 | 131663670 |
| 25 | 320158789 |
| 26 | 779461271 |
| 27 | 1899830067 |
| 28 | 4635492672 |
| 29 | 11321595218 |
| 30 | 27677333555 |
| 31 | 67720658475 |
| 32 | 165835173692 |