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 | 12 |
| 2 | 198 |
| 3 | 3672 |
| 4 | 71766 |
| 5 | 1444392 |
| 6 | 29623644 |
| 7 | 615614256 |
| 8 | 12918175974 |
| 9 | 273112332552 |
| 10 | 5808412280628 |
| 11 | 124127223181776 |
| 12 | 2663248527920124 |
| 13 | 57334738304731536 |
| 14 | 1237861064261885688 |
| 15 | 26791929483836768352 |