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 | 2 |
| 3 | 2 |
| 4 | 108 |
| 5 | 2028 |
| 6 | 32870 |
| 7 | 1213110 |
| 8 | 46493784 |
| 9 | 2310521000 |
| 10 | 137466038346 |
| 11 | 9842687925450 |
| 12 | 832295357128500 |