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 | 16 |
| 5 | 30 |
| 6 | 57 |
| 7 | 108 |
| 8 | 207 |
| 9 | 397 |
| 10 | 761 |
| 11 | 1456 |
| 12 | 2784 |
| 13 | 5324 |
| 14 | 10185 |
| 15 | 19488 |
| 16 | 37288 |
| 17 | 71341 |
| 18 | 136486 |
| 19 | 261117 |
| 20 | 499561 |
| 21 | 955756 |
| 22 | 1828549 |
| 23 | 3498364 |
| 24 | 6693021 |
| 25 | 12804983 |
| 26 | 24498304 |
| 27 | 46869822 |
| 28 | 89670729 |
| 29 | 171556853 |
| 30 | 328220258 |
| 31 | 627946528 |
| 32 | 1201378750 |
| 33 | 2298461537 |
| 34 | 4397385531 |
| 35 | 8413018547 |
| 36 | 16095673253 |
| 37 | 30794024151 |
| 38 | 58914710037 |
| 39 | 112714825621 |
| 40 | 215644478604 |
| 41 | 412568097507 |
| 42 | 789319699503 |
| 43 | 1510115764260 |