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 | 18 |
| 3 | 288 |
| 4 | 1800 |
| 5 | 7200 |
| 6 | 22050 |
| 7 | 56448 |
| 8 | 127008 |
| 9 | 259200 |
| 10 | 490050 |
| 11 | 871200 |
| 12 | 1472328 |
| 13 | 2384928 |
| 14 | 3726450 |
| 15 | 5644800 |
| 16 | 8323200 |
| 17 | 11985408 |
| 18 | 16901298 |
| 19 | 23392800 |
| 20 | 31840200 |
| 21 | 42688800 |
| 22 | 56455938 |
| 23 | 73738368 |
| 24 | 95220000 |
| 25 | 121680000 |
| 26 | 154001250 |
| 27 | 193179168 |
| 28 | 240330888 |
| 29 | 296704800 |
| 30 | 363690450 |