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 | 1 |
| 3 | 3 |
| 4 | 7 |
| 5 | 15 |
| 6 | 21 |
| 7 | 31 |
| 8 | 45 |
| 9 | 63 |
| 10 | 73 |
| 11 | 127 |
| 12 | 153 |
| 13 | 255 |
| 14 | 273 |
| 15 | 341 |
| 16 | 443 |
| 17 | 511 |
| 18 | 561 |
| 19 | 693 |
| 20 | 891 |
| 21 | 1023 |
| 22 | 1057 |
| 23 | 1453 |
| 24 | 1651 |
| 25 | 2047 |
| 26 | 2145 |
| 27 | 2925 |
| 28 | 3315 |
| 29 | 4095 |
| 30 | 4161 |
| 31 | 4681 |
| 32 | 5461 |
| 33 | 5981 |
| 34 | 6371 |
| 35 | 6891 |
| 36 | 7671 |
| 37 | 8191 |
| 38 | 8385 |
| 39 | 9417 |
| 40 | 10965 |
| 41 | 11997 |
| 42 | 12771 |
| 43 | 13803 |
| 44 | 15351 |
| 45 | 16383 |
| 46 | 16513 |
| 47 | 19609 |
| 48 | 21157 |