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 | 1 |
| 2 | 8 |
| 3 | 30 |
| 4 | 224 |
| 5 | 880 |
| 6 | 6656 |
| 7 | 27104 |
| 8 | 206336 |
| 9 | 859392 |
| 10 | 6565888 |
| 11 | 27765760 |
| 12 | 212615168 |
| 13 | 908943360 |
| 14 | 6970998784 |
| 15 | 30045757440 |
| 16 | 230691307520 |
| 17 | 1000634122240 |
| 18 | 7689454223360 |
| 19 | 33522958204928 |
| 20 | 257783270211584 |
| 21 | 1128501249835008 |
| 22 | 8682602001072128 |
| 23 | 38141362595430400 |
| 24 | 293587672402755584 |