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 | 3 |
| 2 | 6 |
| 3 | 11 |
| 4 | 20 |
| 5 | 37 |
| 6 | 70 |
| 7 | 135 |
| 8 | 264 |
| 9 | 521 |
| 10 | 1034 |
| 11 | 2059 |
| 12 | 4108 |
| 13 | 8205 |
| 14 | 16398 |
| 15 | 32783 |
| 16 | 65552 |
| 17 | 131089 |
| 18 | 262162 |
| 19 | 524307 |
| 20 | 1048596 |
| 21 | 2097173 |
| 22 | 4194326 |
| 23 | 8388631 |
| 24 | 16777240 |
| 25 | 33554457 |
| 26 | 67108890 |
| 27 | 134217755 |
| 28 | 268435484 |
| 29 | 536870941 |
| 30 | 1073741854 |
| 31 | 2147483679 |
| 32 | 4294967328 |
| 33 | 8589934625 |