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 | 4 |
| 3 | 7 |
| 4 | 15 |
| 5 | 29 |
| 6 | 61 |
| 7 | 125 |
| 8 | 249 |
| 9 | 497 |
| 10 | 1009 |
| 11 | 2033 |
| 12 | 4081 |
| 13 | 8177 |
| 14 | 16369 |
| 15 | 32753 |
| 16 | 65521 |
| 17 | 131057 |
| 18 | 262081 |
| 19 | 524225 |
| 20 | 1048513 |
| 21 | 2097089 |
| 22 | 4194241 |
| 23 | 8388545 |
| 24 | 16777153 |
| 25 | 33553921 |
| 26 | 67108353 |
| 27 | 134217217 |
| 28 | 268434945 |
| 29 | 536870401 |
| 30 | 1073741313 |
| 31 | 2147483137 |
| 32 | 4294966785 |
| 33 | 8589934081 |
| 34 | 17179868673 |