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 | 38 |
| 4 | 256 |
| 5 | 1805 |
| 6 | 13162 |
| 7 | 98469 |
| 8 | 751656 |
| 9 | 5831451 |
| 10 | 45847770 |
| 11 | 364498596 |
| 12 | 2925337352 |
| 13 | 23668977163 |
| 14 | 192859753310 |
| 15 | 1581188102590 |
| 16 | 13034447714688 |
| 17 | 107971181472779 |
| 18 | 898274382703314 |
| 19 | 7502546644142842 |
| 20 | 62884859093960160 |
| 21 | 528788663216036559 |
| 22 | 4459599092506030110 |