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 | 2 |
| 2 | 12 |
| 3 | 90 |
| 4 | 840 |
| 5 | 11550 |
| 6 | 180180 |
| 7 | 3573570 |
| 8 | 77597520 |
| 9 | 2007835830 |
| 10 | 64696932300 |
| 11 | 2206165391430 |
| 12 | 89048857617720 |
| 13 | 3955253425853730 |
| 14 | 183158658643380420 |
| 15 | 9223346738827371150 |
| 16 | 521426535635040715680 |
| 17 | 32686925952621614864190 |
| 18 | 2111190864469325477698860 |