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 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 9 |
| 6 | 18 |
| 7 | 40 |
| 8 | 80 |
| 9 | 168 |
| 10 | 340 |
| 11 | 698 |
| 12 | 1396 |
| 13 | 2844 |
| 14 | 5688 |
| 15 | 11456 |
| 16 | 22948 |
| 17 | 46072 |
| 18 | 92144 |
| 19 | 184696 |
| 20 | 369392 |
| 21 | 739536 |
| 22 | 1479232 |
| 23 | 2959860 |
| 24 | 5919720 |
| 25 | 11842696 |
| 26 | 23685473 |
| 27 | 47376634 |
| 28 | 94753940 |
| 29 | 189519576 |
| 30 | 379039152 |
| 31 | 758102900 |
| 32 | 1516205800 |