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 | 157 |
| 4 | 26690 |
| 5 | 4508570 |
| 6 | 761974851 |
| 7 | 128773405047 |
| 8 | 21762709934980 |
| 9 | 3677897920745140 |
| 10 | 621564749363392901 |
| 11 | 105044442632566365137 |
| 12 | 17752510805031727164870 |
| 13 | 3000174326048697741925710 |
| 14 | 507029461102251552321630151 |
| 15 | 85687978926280231101185088427 |