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 | 0 |
| 2 | 3 |
| 3 | 60 |
| 4 | 161 |
| 5 | 559 |
| 6 | 660 |
| 7 | 3597 |
| 8 | 78480 |
| 9 | 208079 |
| 10 | 726481 |
| 11 | 856080 |
| 12 | 4669203 |
| 13 | 101866380 |
| 14 | 270087281 |
| 15 | 942970879 |
| 16 | 1111191780 |
| 17 | 6060621597 |
| 18 | 132222483360 |
| 19 | 350573081759 |
| 20 | 1223975475361 |
| 21 | 1442326073760 |
| 22 | 7866682164003 |
| 23 | 171624681534300 |
| 24 | 455043590036801 |