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) |
|---|---|
| 0 | -4 |
| 1 | -5 |
| 2 | -3 |
| 3 | 13 |
| 4 | 17 |
| 5 | 205 |
| 6 | 21 |
| 7 | 3277 |
| 8 | 257 |
| 9 | 4033 |
| 10 | 341 |
| 11 | 838861 |
| 12 | 241 |
| 13 | 13421773 |
| 14 | 5461 |
| 15 | 80581 |
| 16 | 65537 |
| 17 | 3435973837 |
| 18 | 4161 |
| 19 | 54975581389 |
| 20 | 61681 |
| 21 | 20647621 |
| 22 | 1398101 |
| 23 | 14073748835533 |
| 24 | 65281 |
| 25 | 1098438933505 |
| 26 | 22369621 |
| 27 | 68719214593 |