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 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 3 |
| 6 | 7 |
| 7 | 18 |
| 8 | 43 |
| 9 | 96 |
| 10 | 211 |
| 11 | 463 |
| 12 | 992 |
| 13 | 2112 |
| 14 | 4462 |
| 15 | 9347 |
| 16 | 19495 |
| 17 | 40480 |
| 18 | 83690 |
| 19 | 172478 |
| 20 | 354455 |
| 21 | 726538 |
| 22 | 1486024 |
| 23 | 3033644 |
| 24 | 6182389 |
| 25 | 12580486 |