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 | 8 |
| 4 | 17 |
| 5 | 34 |
| 6 | 69 |
| 7 | 138 |
| 8 | 277 |
| 9 | 554 |
| 10 | 1109 |
| 11 | 2218 |
| 12 | 4437 |
| 13 | 8874 |
| 14 | 17749 |
| 15 | 35498 |
| 16 | 70997 |
| 17 | 141994 |
| 18 | 283989 |
| 19 | 567978 |
| 20 | 1135957 |
| 21 | 2271914 |
| 22 | 4543829 |
| 23 | 9087658 |
| 24 | 18175317 |
| 25 | 36350634 |
| 26 | 72701269 |
| 27 | 145402538 |
| 28 | 290805077 |
| 29 | 581610154 |
| 30 | 1163220309 |
| 31 | 2326440618 |
| 32 | 4652881237 |
| 33 | 9305762474 |