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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 0 |
| 12 | 10922 |
| 13 | 929569 |
| 14 | 43800104 |
| 15 | 1513315264 |
| 16 | 42878777216 |
| 17 | 1057229805952 |
| 18 | 23518119959040 |
| 19 | 483438472237056 |
| 20 | 9338507684459520 |
| 21 | 171607973968784640 |
| 22 | 3027838101326610432 |
| 23 | 51660428017842610176 |
| 24 | 857132463549737238528 |