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 | 3 |
| 2 | 5 |
| 3 | 13 |
| 4 | 29 |
| 5 | 61 |
| 6 | 509 |
| 7 | 1021 |
| 8 | 4093 |
| 9 | 16381 |
| 10 | 1048573 |
| 11 | 4194301 |
| 12 | 16777213 |
| 13 | 536870909 |
| 14 | 19807040628566084398385987581 |
| 15 | 83076749736557242056487941267521533 |
| 16 | 5316911983139663491615228241121378301 |