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 | 373 |
| 3 | 8697 |
| 4 | 170148 |
| 5 | 3488015 |
| 6 | 70915451 |
| 7 | 1444700004 |
| 8 | 29426750811 |
| 9 | 599056249102 |
| 10 | 12196183065261 |
| 11 | 248303130737344 |
| 12 | 5055219016095223 |
| 13 | 102918285280874701 |
| 14 | 2095289674633493599 |
| 15 | 42657543159685926011 |
| 16 | 868455498699347842027 |