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 | 6 |
| 2 | 24 |
| 3 | 84 |
| 4 | 332 |
| 5 | 1336 |
| 6 | 5478 |
| 7 | 22658 |
| 8 | 94196 |
| 9 | 392664 |
| 10 | 1639274 |
| 11 | 6849002 |
| 12 | 28627874 |
| 13 | 119688094 |
| 14 | 500456806 |
| 15 | 2092720174 |
| 16 | 8751273556 |
| 17 | 36596513060 |
| 18 | 153042707976 |
| 19 | 640011807436 |
| 20 | 2676483843602 |
| 21 | 11192882945426 |
| 22 | 46807955443900 |