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) |
|---|---|
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 9 |
| 6 | 19 |
| 7 | 40 |
| 8 | 80 |
| 9 | 165 |
| 10 | 330 |
| 11 | 672 |
| 12 | 1344 |
| 13 | 2709 |
| 14 | 5418 |
| 15 | 10878 |
| 16 | 21760 |
| 17 | 43605 |
| 18 | 87211 |
| 19 | 174592 |
| 20 | 349180 |
| 21 | 698707 |
| 22 | 1397418 |
| 23 | 2795520 |
| 24 | 5591040 |
| 25 | 11183436 |
| 26 | 22366890 |
| 27 | 44736512 |
| 28 | 89473020 |
| 29 | 178951509 |
| 30 | 357903000 |
| 31 | 715816960 |
| 32 | 1431633920 |
| 33 | 2863289683 |
| 34 | 5726579370 |
| 35 | 11453202383 |
| 36 | 22906404864 |
| 37 | 45812897109 |
| 38 | 91625794218 |