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 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 7 |
| 5 | 12 |
| 6 | 22 |
| 7 | 42 |
| 8 | 83 |
| 9 | 164 |
| 10 | 326 |
| 11 | 651 |
| 12 | 1301 |
| 13 | 2601 |
| 14 | 5201 |
| 15 | 10400 |
| 16 | 20798 |
| 17 | 41594 |
| 18 | 83187 |
| 19 | 166373 |
| 20 | 332744 |
| 21 | 665487 |
| 22 | 1330972 |
| 23 | 2661943 |
| 24 | 5323885 |
| 25 | 10647769 |
| 26 | 21295536 |
| 27 | 42591070 |
| 28 | 85182139 |
| 29 | 170364276 |
| 30 | 340728551 |
| 31 | 681457100 |