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 | 2 |
| 3 | 4 |
| 4 | 6 |
| 5 | 12 |
| 6 | 20 |
| 7 | 40 |
| 8 | 74 |
| 9 | 148 |
| 10 | 284 |
| 11 | 568 |
| 12 | 1116 |
| 13 | 2232 |
| 14 | 4424 |
| 15 | 8848 |
| 16 | 17622 |
| 17 | 35244 |
| 18 | 70340 |
| 19 | 140680 |
| 20 | 281076 |
| 21 | 562152 |
| 22 | 1123736 |
| 23 | 2247472 |
| 24 | 4493828 |
| 25 | 8987656 |
| 26 | 17973080 |
| 27 | 35946160 |
| 28 | 71887896 |
| 29 | 143775792 |
| 30 | 287542736 |
| 31 | 575085472 |
| 32 | 1150153322 |
| 33 | 2300306644 |
| 34 | 4600578044 |
| 35 | 9201156088 |