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 | 6 |
| 2 | 5 |
| 3 | 187 |
| 4 | 1242 |
| 5 | 9682 |
| 6 | 86538 |
| 7 | 733339 |
| 8 | 5821735 |
| 9 | 56196114 |
| 10 | 503193257 |
| 11 | 4161915701 |
| 12 | 41621368333 |
| 13 | 383118399789 |
| 14 | 3549047966306 |
| 15 | 33056584174792 |
| 16 | 309353882119895 |
| 17 | 2651938403956789 |
| 18 | 27417323062119921 |
| 19 | 27417323062119920 |
| 20 | 2461813897281353902 |
| 21 | 23422580231698331842 |