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 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 65 |
| 7 | 129 |
| 8 | 257 |
| 9 | 20196 |
| 10 | 60074 |
| 11 | 179196 |
| 12 | 17312754 |
| 13 | 68711380 |
| 14 | 273234810 |
| 15 | 31605701625 |
| 16 | 156925970179 |
| 17 | 780248593545 |
| 18 | 105443761093411 |
| 19 | 628709267031321 |
| 20 | 3752628871164355 |
| 21 | 580964060390826448 |
| 22 | 4043844561787569140 |
| 23 | 28170468954985342384 |