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 | 0 |
| 5 | 0 |
| 6 | 35 |
| 7 | 210 |
| 8 | 1001 |
| 9 | 3927 |
| 10 | 13971 |
| 11 | 46592 |
| 12 | 148337 |
| 13 | 455609 |
| 14 | 1362656 |
| 15 | 3989914 |
| 16 | 11504669 |
| 17 | 32804967 |
| 18 | 92877609 |
| 19 | 261846522 |