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) |
|---|---|
| 4 | 32 |
| 5 | 185 |
| 6 | 1308 |
| 7 | 10822 |
| 8 | 102176 |
| 9 | 1081908 |
| 10 | 12681640 |
| 11 | 162880256 |
| 12 | 2273437392 |
| 13 | 34249286656 |
| 14 | 553698389888 |
| 15 | 9558929197560 |
| 16 | 175471796530816 |
| 17 | 3412297318315472 |
| 18 | 70064350595106336 |
| 19 | 1514554957975079008 |
| 20 | 34377185731361631680 |