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 | 1 |
| 7 | 7 |
| 8 | 267 |
| 9 | 2235 |
| 10 | 53830 |
| 11 | 511412 |
| 12 | 11370998 |
| 13 | 122063526 |
| 14 | 2787148807 |
| 15 | 33618432005 |
| 16 | 817366315013 |
| 17 | 10992904020133 |
| 18 | 288039183533356 |
| 19 | 4284317049630762 |
| 20 | 121306011298119784 |
| 21 | 1980129988160763368 |
| 22 | 60512049675634245013 |
| 23 | 1076468156084116242851 |