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 | 24 |
| 4 | 84 |
| 5 | 276 |
| 6 | 880 |
| 7 | 3063 |
| 8 | 10692 |
| 9 | 36257 |
| 10 | 121580 |
| 11 | 436847 |
| 12 | 1530534 |
| 13 | 5259906 |
| 14 | 18389910 |
| 15 | 65748491 |
| 16 | 230935493 |
| 17 | 799429185 |
| 18 | 2860613606 |
| 19 | 10203350814 |
| 20 | 35899202776 |
| 21 | 125660232367 |
| 22 | 453360413253 |
| 23 | 1614905346286 |
| 24 | 5688690345179 |
| 25 | 20241845359246 |
| 26 | 72805688610204 |