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 | 90972 |
| 2 | 937692 |
| 3 | 4548600 |
| 4 | 44030448 |
| 5 | 46884600 |
| 6 | 453842928 |
| 7 | 712931184 |
| 8 | 906494400 |
| 9 | 20907057600 |
| 10 | 34793179200 |
| 11 | 47646797328 |
| 12 | 53469838800 |
| 13 | 240707724300 |