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) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 4 |
| 4 | 6 |
| 5 | 13 |
| 6 | 30 |
| 7 | 64 |
| 8 | 129 |
| 9 | 256 |
| 10 | 510 |
| 11 | 1021 |
| 12 | 2046 |
| 13 | 4096 |
| 14 | 8193 |
| 15 | 16384 |
| 16 | 32766 |
| 17 | 65533 |
| 18 | 131070 |
| 19 | 262144 |
| 20 | 524289 |
| 21 | 1048576 |
| 22 | 2097150 |
| 23 | 4194301 |
| 24 | 8388606 |
| 25 | 16777216 |
| 26 | 33554433 |
| 27 | 67108864 |
| 28 | 134217726 |
| 29 | 268435453 |
| 30 | 536870910 |
| 31 | 1073741824 |
| 32 | 2147483649 |
| 33 | 4294967296 |
| 34 | 8589934590 |