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 | 5 |
| 3 | 105 |
| 4 | 1245 |
| 5 | 11075 |
| 6 | 82918 |
| 7 | 545544 |
| 8 | 3226809 |
| 9 | 17404018 |
| 10 | 86501661 |
| 11 | 399545336 |
| 12 | 1727261600 |
| 13 | 7031347337 |
| 14 | 27094936830 |
| 15 | 99286765543 |