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) |
|---|---|
| 2 | 1 |
| 3 | 57 |
| 4 | 3705 |
| 5 | 236665 |
| 6 | 15150201 |
| 7 | 969583737 |
| 8 | 62053592185 |
| 9 | 3971428035705 |
| 10 | 254171409198201 |
| 11 | 16266970069380217 |
| 12 | 1041086085394771065 |
| 13 | 66629509457629850745 |
| 14 | 4264288605349394427001 |
| 15 | 272914470741872571493497 |