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 | 15 |
| 2 | 210 |
| 3 | 2835 |
| 4 | 38220 |
| 5 | 514605 |
| 6 | 6928740 |
| 7 | 93285465 |
| 8 | 1255955610 |
| 9 | 16909618635 |
| 10 | 227663487870 |
| 11 | 3065158424055 |
| 12 | 41267909559240 |
| 13 | 555612506386665 |
| 14 | 7480515990707760 |
| 15 | 100714290692336685 |
| 16 | 1355971748798391270 |