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 | 18 |
| 2 | 52 |
| 3 | 120 |
| 4 | 320 |
| 5 | 848 |
| 6 | 2314 |
| 7 | 6374 |
| 8 | 17752 |
| 9 | 49800 |
| 10 | 140582 |
| 11 | 398834 |
| 12 | 1136270 |
| 13 | 3248718 |
| 14 | 9316828 |
| 15 | 26790080 |
| 16 | 77212552 |
| 17 | 222993608 |
| 18 | 645193126 |
| 19 | 1869809474 |
| 20 | 5426815810 |
| 21 | 15771487250 |
| 22 | 45891045208 |
| 23 | 133679744924 |
| 24 | 389803622998 |