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 | 12 |
| 3 | 360 |
| 4 | 9828 |
| 5 | 265680 |
| 6 | 7174332 |
| 7 | 193709880 |
| 8 | 5230175508 |
| 9 | 141214764960 |
| 10 | 3812798732652 |
| 11 | 102945566017800 |
| 12 | 2779530283189188 |
| 13 | 75047317648233840 |
| 14 | 2026277576508690972 |
| 15 | 54709494565753788120 |
| 16 | 1477156353275409674868 |
| 17 | 39883221538436233408320 |
| 18 | 1076846981537778818585292 |