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 | 13 |
| 2 | 1581 |
| 3 | 39684 |
| 4 | 647617 |
| 5 | 7058469 |
| 6 | 57031078 |
| 7 | 363862092 |
| 8 | 1918222840 |
| 9 | 8641355080 |
| 10 | 34132685120 |
| 11 | 120629547584 |
| 12 | 387665694976 |
| 13 | 1145875468544 |
| 14 | 3145428883520 |