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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 3 |
| 5 | 6 |
| 6 | 14 |
| 7 | 28 |
| 8 | 31 |
| 9 | 59 |
| 10 | 123 |
| 11 | 243 |
| 12 | 499 |
| 13 | 995 |
| 14 | 2019 |
| 15 | 2028 |
| 16 | 2045 |
| 17 | 4061 |
| 18 | 4095 |
| 19 | 8127 |
| 20 | 16319 |
| 21 | 32575 |
| 22 | 65343 |
| 23 | 130623 |
| 24 | 261695 |
| 25 | 523327 |
| 26 | 1047615 |
| 27 | 2095167 |
| 28 | 4192319 |
| 29 | 8386611 |
| 30 | 8386679 |
| 31 | 16775270 |
| 32 | 16775279 |
| 33 | 33550447 |
| 34 | 67104879 |
| 35 | 134213709 |
| 36 | 134213727 |
| 37 | 268427359 |
| 38 | 536862815 |