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 | 2 |
| 2 | 6 |
| 3 | 11 |
| 4 | 20 |
| 5 | 38 |
| 6 | 71 |
| 7 | 136 |
| 8 | 265 |
| 9 | 523 |
| 10 | 1036 |
| 11 | 2061 |
| 12 | 4110 |
| 13 | 8207 |
| 14 | 16400 |
| 15 | 32785 |
| 16 | 65554 |
| 17 | 131092 |
| 18 | 262165 |
| 19 | 524310 |
| 20 | 1048599 |
| 21 | 2097176 |
| 22 | 4194329 |
| 23 | 8388634 |
| 24 | 16777243 |
| 25 | 33554460 |
| 26 | 67108893 |
| 27 | 134217758 |
| 28 | 268435487 |
| 29 | 536870944 |
| 30 | 1073741857 |
| 31 | 2147483682 |