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 | 5 |
| 2 | 22 |
| 3 | 105 |
| 4 | 567 |
| 5 | 3351 |
| 6 | 20676 |
| 7 | 129129 |
| 8 | 804817 |
| 9 | 4982759 |
| 10 | 30629206 |
| 11 | 187121865 |
| 12 | 1137631979 |
| 13 | 6891047527 |
| 14 | 41628865000 |
| 15 | 250987078681 |
| 16 | 1511105743781 |
| 17 | 9088662549303 |
| 18 | 54625229882746 |
| 19 | 328144877989145 |
| 20 | 1970524978549951 |