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 | 6 |
| 2 | 30 |
| 3 | 150 |
| 4 | 720 |
| 5 | 3480 |
| 6 | 16680 |
| 7 | 80040 |
| 8 | 383520 |
| 9 | 1838160 |
| 10 | 8807400 |
| 11 | 42202560 |
| 12 | 202209720 |
| 13 | 968880960 |
| 14 | 4642304520 |
| 15 | 22243228680 |
| 16 | 106576361760 |
| 17 | 510651000360 |