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) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 176 |
| 6 | 3145 |
| 7 | 22969 |
| 8 | 106819 |
| 9 | 376796 |
| 10 | 1101151 |
| 11 | 2805825 |
| 12 | 6438909 |
| 13 | 13602304 |
| 14 | 26866541 |
| 15 | 50186401 |
| 16 | 89436655 |
| 17 | 153088924 |
| 18 | 253052339 |
| 19 | 405702361 |
| 20 | 633123801 |
| 21 | 964595760 |
| 22 | 1438347889 |
| 23 | 2103619049 |
| 24 | 3023051131 |
| 25 | 4275452476 |
| 26 | 5958967015 |
| 27 | 8194686929 |
| 28 | 11130748309 |