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 | 7 |
| 1 | 8 |
| 2 | 10 |
| 3 | 14 |
| 4 | 22 |
| 5 | 38 |
| 6 | 70 |
| 7 | 134 |
| 8 | 262 |
| 9 | 518 |
| 10 | 1030 |
| 11 | 2054 |
| 12 | 4102 |
| 13 | 8198 |
| 14 | 16390 |
| 15 | 32774 |
| 16 | 65542 |
| 17 | 131078 |
| 18 | 262150 |
| 19 | 524294 |
| 20 | 1048582 |
| 21 | 2097158 |
| 22 | 4194310 |
| 23 | 8388614 |
| 24 | 16777222 |
| 25 | 33554438 |
| 26 | 67108870 |
| 27 | 134217734 |
| 28 | 268435462 |
| 29 | 536870918 |
| 30 | 1073741830 |
| 31 | 2147483654 |