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 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 45 |
| 6 | 393 |
| 7 | 977 |
| 8 | 2585 |
| 9 | 2810 |
| 10 | 2967 |
| 11 | 3641 |
| 12 | 4826 |
| 13 | 4917 |
| 14 | 5591 |
| 15 | 5705 |
| 16 | 10682 |
| 17 | 12890 |
| 18 | 14117 |
| 19 | 74349 |
| 20 | 88679 |