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 | 63 |
| 2 | 255 |
| 3 | 575 |
| 4 | 1023 |
| 5 | 1599 |
| 6 | 2303 |
| 7 | 3135 |
| 8 | 4095 |
| 9 | 5183 |
| 10 | 6399 |
| 11 | 7743 |
| 12 | 9215 |
| 13 | 10815 |
| 14 | 12543 |
| 15 | 14399 |
| 16 | 16383 |
| 17 | 18495 |
| 18 | 20735 |
| 19 | 23103 |
| 20 | 25599 |
| 21 | 28223 |
| 22 | 30975 |
| 23 | 33855 |
| 24 | 36863 |
| 25 | 39999 |
| 26 | 43263 |
| 27 | 46655 |
| 28 | 50175 |
| 29 | 53823 |
| 30 | 57599 |
| 31 | 61503 |
| 32 | 65535 |
| 33 | 69695 |
| 34 | 73983 |
| 35 | 78399 |
| 36 | 82943 |
| 37 | 87615 |
| 38 | 92415 |
| 39 | 97343 |
| 40 | 102399 |