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) |
|---|---|
| 1 | 2 |
| 2 | 5 |
| 3 | 11 |
| 4 | 23 |
| 5 | 47 |
| 6 | 97 |
| 7 | 197 |
| 8 | 397 |
| 9 | 797 |
| 10 | 1597 |
| 11 | 3203 |
| 12 | 6421 |
| 13 | 12853 |
| 14 | 25717 |
| 15 | 51437 |
| 16 | 102877 |
| 17 | 205759 |
| 18 | 411527 |
| 19 | 823117 |
| 20 | 1646237 |
| 21 | 3292489 |
| 22 | 6584983 |
| 23 | 13169977 |
| 24 | 26339969 |
| 25 | 52679969 |
| 26 | 105359939 |
| 27 | 210719881 |
| 28 | 421439783 |
| 29 | 842879579 |
| 30 | 1685759167 |
| 31 | 3371518343 |