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) |
|---|---|
| 7 | 1 |
| 8 | 21 |
| 9 | 322 |
| 10 | 4536 |
| 11 | 68313 |
| 12 | 1123815 |
| 13 | 19826015 |
| 14 | 368232150 |
| 15 | 7247538298 |
| 16 | 152150838840 |
| 17 | 3403471995560 |
| 18 | 80589585571040 |
| 19 | 2012376195058384 |
| 20 | 52929114594971184 |
| 21 | 1464737200231998960 |
| 22 | 42545324327111272800 |
| 23 | 1293727732305595341216 |