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 | 1 |
| 2 | 3 |
| 3 | 5 |
| 4 | 10 |
| 5 | 21 |
| 6 | 41 |
| 7 | 83 |
| 8 | 165 |
| 9 | 330 |
| 10 | 661 |
| 11 | 1321 |
| 12 | 2642 |
| 13 | 5285 |
| 14 | 10569 |
| 15 | 21139 |
| 16 | 42277 |
| 17 | 84554 |
| 18 | 169109 |
| 19 | 338217 |
| 20 | 676435 |
| 21 | 1352869 |
| 22 | 2705738 |
| 23 | 5411477 |
| 24 | 10822953 |
| 25 | 21645906 |
| 26 | 43291813 |
| 27 | 86583625 |
| 28 | 173167251 |
| 29 | 346334501 |
| 30 | 692669002 |
| 31 | 1385338005 |
| 32 | 2770676009 |
| 33 | 5541352018 |
| 34 | 11082704037 |
| 35 | 22165408073 |
| 36 | 44330816147 |
| 37 | 88661632293 |
| 38 | 177323264586 |
| 39 | 354646529173 |
| 40 | 709293058345 |