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 | 5 |
| 2 | 15 |
| 3 | 35 |
| 4 | 140 |
| 5 | 1820 |
| 6 | 11375 |
| 7 | 820820 |
| 8 | 19019000 |
| 9 | 10790015600 |
| 10 | 1568726956160 |
| 11 | 7278234628665 |
| 12 | 7271181889157550 |