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 | 1 |
| 2 | 6 |
| 3 | 46 |
| 4 | 361 |
| 5 | 2841 |
| 6 | 22366 |
| 7 | 176086 |
| 8 | 1386321 |
| 9 | 10914481 |
| 10 | 85929526 |
| 11 | 676521726 |
| 12 | 5326244281 |
| 13 | 41933432521 |
| 14 | 330141215886 |
| 15 | 2599196294566 |
| 16 | 20463429140641 |
| 17 | 161108236830561 |
| 18 | 1268402465503846 |
| 19 | 9986111487200206 |
| 20 | 78620489432097801 |
| 21 | 618977803969582201 |
| 22 | 4873201942324559806 |