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 | 3 |
| 3 | 3 |
| 4 | 60 |
| 5 | 60 |
| 6 | 201 |
| 7 | 481 |
| 8 | 5989 |
| 9 | 3122037 |
| 10 | 4434429 |
| 11 | 13576837 |
| 12 | 183894465 |
| 13 | 187925171 |
| 14 | 209072257 |
| 15 | 1498642520 |
| 16 | 12239200420 |
| 17 | 20220712468 |
| 18 | 20220712468 |
| 19 | 875023683404 |
| 20 | 992997544772 |
| 21 | 2721798771116 |
| 22 | 9770941874212 |
| 23 | 9770941874212 |