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 | 1 |
| 2 | 3 |
| 3 | 21 |
| 4 | 147 |
| 5 | 171 |
| 6 | 657 |
| 7 | 903 |
| 8 | 1029 |
| 9 | 1197 |
| 10 | 2667 |
| 11 | 3249 |
| 12 | 4599 |
| 13 | 6321 |
| 14 | 7077 |
| 15 | 7203 |
| 16 | 8379 |
| 17 | 12483 |
| 18 | 13203 |
| 19 | 18669 |
| 20 | 22743 |
| 21 | 32193 |
| 22 | 38829 |
| 23 | 44247 |
| 24 | 47961 |
| 25 | 49539 |
| 26 | 50421 |
| 27 | 51471 |
| 28 | 58653 |
| 29 | 61731 |
| 30 | 71631 |
| 31 | 87381 |
| 32 | 92421 |
| 33 | 97641 |
| 34 | 113799 |
| 35 | 114681 |
| 36 | 118341 |
| 37 | 130683 |
| 38 | 152019 |
| 39 | 159201 |
| 40 | 197757 |