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 | 2 |
| 1 | 0 |
| 2 | 14 |
| 3 | 45 |
| 4 | 198 |
| 5 | 5114 |
| 6 | 65174 |
| 7 | 1086194 |
| 8 | 20485574 |
| 9 | 465779078 |
| 10 | 0 |
| 11 | 293420849770 |
| 12 | 318745032938881 |