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 | 7 |
| 3 | 16 |
| 4 | 33 |
| 5 | 66 |
| 6 | 131 |
| 7 | 260 |
| 8 | 517 |
| 9 | 1030 |
| 10 | 2055 |
| 11 | 4104 |
| 12 | 8201 |
| 13 | 16394 |
| 14 | 32779 |
| 15 | 65548 |
| 16 | 131085 |
| 17 | 262158 |
| 18 | 524303 |
| 19 | 1048592 |
| 20 | 2097169 |
| 21 | 4194322 |
| 22 | 8388627 |
| 23 | 16777236 |
| 24 | 33554453 |
| 25 | 67108886 |
| 26 | 134217751 |
| 27 | 268435480 |
| 28 | 536870937 |
| 29 | 1073741850 |
| 30 | 2147483675 |
| 31 | 4294967324 |
| 32 | 8589934621 |