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 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 14 |
| 5 | 30 |
| 6 | 62 |
| 7 | 125 |
| 8 | 253 |
| 9 | 509 |
| 10 | 1020 |
| 11 | 2044 |
| 12 | 4092 |
| 13 | 8188 |
| 14 | 16379 |
| 15 | 32763 |
| 16 | 65531 |
| 17 | 131066 |
| 18 | 262138 |
| 19 | 524282 |
| 20 | 1048569 |
| 21 | 2097145 |
| 22 | 4194297 |
| 23 | 8388601 |
| 24 | 16777208 |
| 25 | 33554424 |
| 26 | 67108856 |
| 27 | 134217719 |
| 28 | 268435447 |
| 29 | 536870903 |
| 30 | 1073741814 |
| 31 | 2147483638 |
| 32 | 4294967286 |
| 33 | 8589934582 |