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) |
|---|---|
| 1 | 6 |
| 2 | 24 |
| 3 | 128 |
| 4 | 222 |
| 5 | 500 |
| 6 | 956 |
| 7 | 1876 |
| 8 | 3538 |
| 9 | 6622 |
| 10 | 12200 |
| 11 | 22274 |
| 12 | 40302 |
| 13 | 72418 |
| 14 | 129332 |
| 15 | 229780 |
| 16 | 406378 |
| 17 | 715800 |
| 18 | 1256248 |
| 19 | 2197512 |
| 20 | 3832510 |
| 21 | 6665570 |
| 22 | 11563364 |
| 23 | 20012598 |