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 | 1 |
| 2 | 15 |
| 3 | 301 |
| 4 | 7770 |
| 5 | 246730 |
| 6 | 9321312 |
| 7 | 408741333 |
| 8 | 20415995028 |
| 9 | 1144614626805 |
| 10 | 71187132291275 |
| 11 | 4864251308951100 |
| 12 | 362262620784874680 |
| 13 | 29206898819153109600 |
| 14 | 2534474684137526739000 |
| 15 | 235535731151727520125765 |
| 16 | 23339590705557273894321960 |