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 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | 16 |
| 6 | 32 |
| 7 | 64 |
| 8 | 129 |
| 9 | 259 |
| 10 | 519 |
| 11 | 1036 |
| 12 | 2074 |
| 13 | 4150 |
| 14 | 8296 |
| 15 | 16600 |
| 16 | 33208 |
| 17 | 66424 |
| 18 | 132832 |
| 19 | 265696 |
| 20 | 531424 |
| 21 | 1062880 |
| 22 | 2125696 |
| 23 | 4251521 |
| 24 | 8502785 |
| 25 | 17005825 |
| 26 | 34011905 |
| 27 | 68023301 |
| 28 | 136047622 |
| 29 | 272093206 |
| 30 | 544188470 |
| 31 | 1088378998 |
| 32 | 2176753882 |
| 33 | 4353515996 |
| 34 | 8707015520 |
| 35 | 17414063992 |
| 36 | 34828160840 |
| 37 | 69656354600 |
| 38 | 139312643368 |