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 | 21 |
| 2 | 1492 |
| 3 | 51229 |
| 4 | 1548002 |
| 5 | 43798840 |
| 6 | 1133034160 |
| 7 | 26606146271 |
| 8 | 577253086055 |
| 9 | 11856994168275 |
| 10 | 234252250004719 |
| 11 | 4462457602929707 |
| 12 | 81437338008292870 |
| 13 | 1411665474225016752 |
| 14 | 23098384621606953307 |
| 15 | 355699829714059120732 |