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 | 2 |
| 2 | 9 |
| 3 | 8 |
| 4 | 17 |
| 5 | 34 |
| 6 | 64 |
| 7 | 129 |
| 8 | 252 |
| 9 | 515 |
| 10 | 1026 |
| 11 | 2044 |
| 12 | 4091 |
| 13 | 8184 |
| 14 | 16375 |
| 15 | 32758 |
| 16 | 65525 |
| 17 | 131060 |
| 18 | 262131 |
| 19 | 524279 |
| 20 | 1048566 |
| 21 | 2097167 |
| 22 | 4194322 |
| 23 | 8388590 |
| 24 | 16777203 |
| 25 | 33554450 |
| 26 | 67108877 |
| 27 | 134217712 |
| 28 | 268435473 |
| 29 | 536870929 |
| 30 | 1073741807 |
| 31 | 2147483622 |
| 32 | 4294967278 |
| 33 | 8589934615 |