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 | 1 |
| 1 | 3 |
| 2 | 5 |
| 3 | 9 |
| 4 | 25 |
| 5 | 33 |
| 6 | 65 |
| 7 | 225 |
| 8 | 257 |
| 9 | 513 |
| 10 | 1665 |
| 11 | 2049 |
| 12 | 5121 |
| 13 | 12801 |
| 14 | 16385 |
| 15 | 32769 |
| 16 | 100353 |
| 17 | 180225 |
| 18 | 262145 |
| 19 | 794625 |
| 20 | 1048577 |
| 21 | 2097153 |
| 22 | 7634945 |
| 23 | 8388609 |
| 24 | 18874369 |
| 25 | 50462721 |
| 26 | 67108865 |
| 27 | 171966465 |
| 28 | 403177473 |
| 29 | 536870913 |
| 30 | 1073741825 |