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 | 0 |
| 2 | 5 |
| 3 | 360 |
| 4 | 7350 |
| 5 | 73700 |
| 6 | 474588 |
| 7 | 2292790 |
| 8 | 9046807 |
| 9 | 30676440 |
| 10 | 92393015 |
| 11 | 252872984 |
| 12 | 639382605 |
| 13 | 1512137536 |
| 14 | 3377126024 |
| 15 | 7176513960 |
| 16 | 14599539314 |
| 17 | 28575632350 |
| 18 | 54036739617 |
| 19 | 99069119952 |
| 20 | 176618150000 |
| 21 | 306965183268 |
| 22 | 521265871700 |
| 23 | 866527603370 |
| 24 | 1412513294049 |