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 | 1 |
| 1 | 3 |
| 2 | 8 |
| 3 | 24 |
| 4 | 120 |
| 5 | 840 |
| 6 | 9240 |
| 7 | 120120 |
| 8 | 2042040 |
| 9 | 38798760 |
| 10 | 892371480 |
| 11 | 25878772920 |
| 12 | 802241960520 |
| 13 | 29682952539240 |
| 14 | 1217001054108840 |
| 15 | 52331045326680120 |
| 16 | 2459559130353965640 |
| 17 | 130356633908760178920 |
| 18 | 7691041400616850556280 |