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 | 3 |
| 1 | 5 |
| 2 | 7 |
| 3 | 13 |
| 4 | 19 |
| 5 | 41 |
| 6 | 71 |
| 7 | 137 |
| 8 | 263 |
| 9 | 523 |
| 10 | 1033 |
| 11 | 2063 |
| 12 | 4111 |
| 13 | 8219 |
| 14 | 16417 |
| 15 | 32779 |
| 16 | 65539 |
| 17 | 131111 |
| 18 | 262151 |
| 19 | 524341 |
| 20 | 1048589 |
| 21 | 2097211 |
| 22 | 4194329 |
| 23 | 8388619 |
| 24 | 16777289 |
| 25 | 33554473 |
| 26 | 67108913 |
| 27 | 134217773 |
| 28 | 268435463 |
| 29 | 536870951 |
| 30 | 1073741831 |
| 31 | 2147483693 |