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 | 2 |
| 1 | 5 |
| 2 | 9 |
| 3 | 15 |
| 4 | 25 |
| 5 | 43 |
| 6 | 77 |
| 7 | 143 |
| 8 | 273 |
| 9 | 531 |
| 10 | 1045 |
| 11 | 2071 |
| 12 | 4121 |
| 13 | 8219 |
| 14 | 16413 |
| 15 | 32799 |
| 16 | 65569 |
| 17 | 131107 |
| 18 | 262181 |
| 19 | 524327 |
| 20 | 1048617 |
| 21 | 2097195 |
| 22 | 4194349 |
| 23 | 8388655 |
| 24 | 16777265 |
| 25 | 33554483 |
| 26 | 67108917 |
| 27 | 134217783 |
| 28 | 268435513 |
| 29 | 536870971 |
| 30 | 1073741885 |
| 31 | 2147483711 |
| 32 | 4294967361 |
| 33 | 8589934659 |
| 34 | 17179869253 |