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 | 15 |
| 1 | 143 |
| 2 | 399 |
| 3 | 783 |
| 4 | 1295 |
| 5 | 1935 |
| 6 | 2703 |
| 7 | 3599 |
| 8 | 4623 |
| 9 | 5775 |
| 10 | 7055 |
| 11 | 8463 |
| 12 | 9999 |
| 13 | 11663 |
| 14 | 13455 |
| 15 | 15375 |
| 16 | 17423 |
| 17 | 19599 |
| 18 | 21903 |
| 19 | 24335 |
| 20 | 26895 |
| 21 | 29583 |
| 22 | 32399 |
| 23 | 35343 |
| 24 | 38415 |
| 25 | 41615 |
| 26 | 44943 |
| 27 | 48399 |
| 28 | 51983 |
| 29 | 55695 |
| 30 | 59535 |
| 31 | 63503 |
| 32 | 67599 |
| 33 | 71823 |
| 34 | 76175 |
| 35 | 80655 |
| 36 | 85263 |
| 37 | 89999 |
| 38 | 94863 |
| 39 | 99855 |