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 | 1 |
| 2 | 9 |
| 3 | 65 |
| 4 | 73 |
| 5 | 513 |
| 6 | 585 |
| 7 | 4097 |
| 8 | 4161 |
| 9 | 4681 |
| 10 | 32769 |
| 11 | 37449 |
| 12 | 262145 |
| 13 | 262657 |
| 14 | 266305 |
| 15 | 299593 |
| 16 | 2097153 |
| 17 | 2396745 |
| 18 | 16777217 |
| 19 | 16781313 |
| 20 | 17043521 |
| 21 | 19173961 |
| 22 | 134217729 |
| 23 | 134480385 |
| 24 | 153391689 |
| 25 | 1073741825 |
| 26 | 1073774593 |
| 27 | 1090785345 |
| 28 | 1227133513 |
| 29 | 8589934593 |
| 30 | 9817068105 |