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 | 10 |
| 2 | 70 |
| 3 | 700 |
| 4 | 104968 |
| 5 | 1398500 |
| 6 | 268439590 |
| 7 | 3817763740 |
| 8 | 799645010860 |
| 9 | 2573485510942780 |
| 10 | 38430716856090160 |
| 11 | 131176846748288854980 |
| 12 | 30223145490393217217464 |
| 13 | 460543169377106318541400 |
| 14 | 107646959937860684094362500 |
| 15 | 390046338531762979375904093800 |