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 | 31 |
| 3 | 242 |
| 4 | 1023 |
| 5 | 3124 |
| 6 | 7775 |
| 7 | 16806 |
| 8 | 32767 |
| 9 | 59048 |
| 10 | 99999 |
| 11 | 161050 |
| 12 | 248831 |
| 13 | 371292 |
| 14 | 537823 |
| 15 | 759374 |
| 16 | 1048575 |
| 17 | 1419856 |
| 18 | 1889567 |
| 19 | 2476098 |
| 20 | 3199999 |
| 21 | 4084100 |
| 22 | 5153631 |
| 23 | 6436342 |
| 24 | 7962623 |
| 25 | 9765624 |
| 26 | 11881375 |
| 27 | 14348906 |
| 28 | 17210367 |
| 29 | 20511148 |
| 30 | 24299999 |
| 31 | 28629150 |
| 32 | 33554431 |