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 | 0 |
| 3 | 0 |
| 4 | 32 |
| 5 | 348 |
| 6 | 2836 |
| 7 | 21225 |
| 8 | 154741 |
| 9 | 1123143 |
| 10 | 8185403 |
| 11 | 60088748 |
| 12 | 444688325 |
| 13 | 3317057654 |
| 14 | 24925158492 |
| 15 | 188543716451 |
| 16 | 1434760675947 |
| 17 | 10976610064899 |
| 18 | 84379534826376 |
| 19 | 651441493579872 |