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 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 10 |
| 5 | 22 |
| 6 | 44 |
| 7 | 88 |
| 8 | 177 |
| 9 | 355 |
| 10 | 710 |
| 11 | 1421 |
| 12 | 2843 |
| 13 | 5687 |
| 14 | 11374 |
| 15 | 22748 |
| 16 | 45497 |
| 17 | 90995 |
| 18 | 181991 |
| 19 | 363982 |
| 20 | 727965 |
| 21 | 1455930 |
| 22 | 2911861 |
| 23 | 5823723 |
| 24 | 11647446 |
| 25 | 23294892 |
| 26 | 46589786 |
| 27 | 93179572 |
| 28 | 186359144 |
| 29 | 372718289 |