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 | 5 |
| 2 | 40 |
| 3 | 520 |
| 4 | 2800 |
| 5 | 26840 |
| 6 | 61880 |
| 7 | 236640 |
| 8 | 412680 |
| 9 | 1072720 |
| 10 | 3418520 |
| 11 | 4771520 |
| 12 | 11557320 |
| 13 | 19309360 |
| 14 | 24501400 |
| 15 | 38224160 |
| 16 | 69699240 |
| 17 | 119154040 |
| 18 | 140766040 |
| 19 | 225020840 |
| 20 | 300704880 |
| 21 | 345511920 |
| 22 | 512842720 |
| 23 | 656506760 |
| 24 | 930676560 |
| 25 | 1431223360 |