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 | 0 |
| 1 | 15 |
| 2 | 240 |
| 3 | 255 |
| 4 | 3840 |
| 5 | 3855 |
| 6 | 4080 |
| 7 | 4095 |
| 8 | 61440 |
| 9 | 61455 |
| 10 | 61680 |
| 11 | 61695 |
| 12 | 65280 |
| 13 | 65295 |
| 14 | 65520 |
| 15 | 65535 |
| 16 | 983040 |
| 17 | 983055 |
| 18 | 983280 |
| 19 | 983295 |
| 20 | 986880 |
| 21 | 986895 |
| 22 | 987120 |
| 23 | 987135 |
| 24 | 1044480 |
| 25 | 1044495 |
| 26 | 1044720 |
| 27 | 1044735 |
| 28 | 1048320 |
| 29 | 1048335 |
| 30 | 1048560 |
| 31 | 1048575 |