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 | 185 |
| 3 | 4081 |
| 4 | 251720 |
| 5 | 10599449 |
| 6 | 524539713 |
| 7 | 24377674329 |
| 8 | 1162453545201 |
| 9 | 54868164490816 |
| 10 | 2600517767888745 |
| 11 | 123049732810644217 |
| 12 | 5826272557390770993 |
| 13 | 275793998574143720745 |
| 14 | 13056461887253840005544 |
| 15 | 618083925262185774246993 |