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 | 4095 |
| 2 | 32767 |
| 3 | 65535 |
| 4 | 67053 |
| 5 | 262143 |
| 6 | 265720 |
| 7 | 531440 |
| 8 | 1048575 |
| 9 | 2097151 |
| 10 | 4381419 |
| 11 | 5592405 |
| 12 | 7174453 |
| 13 | 9808617 |
| 14 | 11184810 |
| 15 | 13938267 |
| 16 | 14348906 |
| 17 | 16777215 |
| 18 | 19617234 |
| 19 | 21523360 |
| 20 | 29425851 |
| 21 | 39234468 |
| 22 | 43046720 |
| 23 | 48686547 |
| 24 | 49043085 |
| 25 | 58851702 |
| 26 | 61035156 |
| 27 | 68660319 |
| 28 | 71270178 |