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 | 1 |
| 3 | 1 |
| 4 | 1345 |
| 5 | 666625 |
| 6 | 223985665 |
| 7 | 65019838465 |
| 8 | 105072058957825 |
| 9 | 11436238073940148225 |
| 10 | 997931868985434228916225 |
| 11 | 74706800043914446529756135425 |
| 12 | 5321514758546715999509008953114625 |
| 13 | 3721818216683598164434468712927276826625 |