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 | 3 |
| 2 | 8 |
| 3 | 18 |
| 4 | 40 |
| 5 | 84 |
| 6 | 174 |
| 7 | 354 |
| 8 | 716 |
| 9 | 1440 |
| 10 | 2890 |
| 11 | 5790 |
| 12 | 11592 |
| 13 | 23196 |
| 14 | 46406 |
| 15 | 92826 |
| 16 | 185668 |
| 17 | 371352 |
| 18 | 742722 |
| 19 | 1485462 |
| 20 | 2970944 |
| 21 | 5941908 |
| 22 | 11883838 |
| 23 | 23767698 |
| 24 | 47535420 |
| 25 | 95070864 |
| 26 | 190141754 |
| 27 | 380283534 |
| 28 | 760567096 |
| 29 | 1521134220 |
| 30 | 3042268470 |
| 31 | 6084536970 |
| 32 | 12169073972 |