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 | 15 |
| 4 | 35 |
| 5 | 1531513 |
| 6 | 2042057 |
| 7 | 3828689 |
| 8 | 4849879 |
| 9 | 5615321 |
| 10 | 8933993 |
| 11 | 9189469 |
| 12 | 14038957 |
| 13 | 16591609 |
| 14 | 17867867 |
| 15 | 20165077 |
| 16 | 20420417 |
| 17 | 28843849 |
| 18 | 31396331 |
| 19 | 34204153 |
| 20 | 37522621 |
| 21 | 43648643 |
| 22 | 82447517 |