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 | 90 |
| 2 | 630 |
| 3 | 2310 |
| 4 | 6930 |
| 5 | 34650 |
| 6 | 30030 |
| 7 | 90090 |
| 8 | 450450 |
| 9 | 570570 |
| 10 | 510510 |
| 11 | 1531530 |
| 12 | 7657650 |
| 13 | 14804790 |
| 14 | 11741730 |
| 15 | 9699690 |
| 16 | 29099070 |
| 17 | 145495350 |