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 | 2576 |
| 2 | 535095 |
| 3 | 18106704 |
| 4 | 369844880 |
| 5 | 6101289120 |
| 6 | 90184804281 |
| 7 | 1251098739072 |
| 8 | 16681003659936 |
| 9 | 216644275600560 |
| 10 | 2763033644875595 |
| 11 | 34784314216176096 |
| 12 | 433742858109499536 |
| 13 | 5369839142579042560 |