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 | 2 |
| 2 | 5 |
| 3 | 11 |
| 4 | 23 |
| 5 | 41 |
| 6 | 83 |
| 7 | 131 |
| 8 | 281 |
| 9 | 593 |
| 10 | 1031 |
| 11 | 2063 |
| 12 | 4211 |
| 13 | 8243 |
| 14 | 16421 |
| 15 | 32771 |
| 16 | 65633 |
| 17 | 131321 |
| 18 | 262193 |
| 19 | 524351 |
| 20 | 1048889 |
| 21 | 2097629 |
| 22 | 4194581 |
| 23 | 8388953 |
| 24 | 16777259 |
| 25 | 33554771 |
| 26 | 67108913 |
| 27 | 134218433 |
| 28 | 268435631 |
| 29 | 536871311 |
| 30 | 1073741891 |
| 31 | 2147483693 |
| 32 | 4294967681 |
| 33 | 8589934631 |
| 34 | 17179869659 |