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 | 6 |
| 5 | 13 |
| 6 | 37 |
| 7 | 106 |
| 8 | 409 |
| 9 | 1896 |
| 10 | 12171 |
| 11 | 105070 |
| 12 | 1262179 |
| 13 | 20797001 |
| 14 | 467871368 |
| 15 | 14232552451 |
| 16 | 581460254000 |
| 17 | 31720840164949 |