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 | 2 |
| 2 | 4 |
| 3 | 4 |
| 4 | 8 |
| 5 | 12 |
| 6 | 24 |
| 7 | 40 |
| 8 | 80 |
| 9 | 140 |
| 10 | 280 |
| 11 | 504 |
| 12 | 1008 |
| 13 | 1848 |
| 14 | 3696 |
| 15 | 6864 |
| 16 | 13726 |
| 17 | 25740 |
| 18 | 51450 |
| 19 | 97240 |
| 20 | 194210 |
| 21 | 369512 |
| 22 | 737124 |
| 23 | 1410864 |
| 24 | 2810178 |
| 25 | 5408312 |
| 26 | 10752868 |
| 27 | 20801200 |
| 28 | 41273500 |
| 29 | 80233200 |
| 30 | 158851800 |
| 31 | 310235040 |
| 32 | 612835830 |
| 33 | 1202160780 |
| 34 | 2369260560 |
| 35 | 4667212440 |