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 | 1 |
| 1 | 2 |
| 2 | 0 |
| 3 | 50 |
| 4 | 773 |
| 5 | 48 |
| 6 | 83 |
| 7 | 150 |
| 8 | 281 |
| 9 | 540 |
| 10 | 1055 |
| 11 | 2082 |
| 12 | 4133 |
| 13 | 8232 |
| 14 | 16427 |
| 15 | 32814 |
| 16 | 65585 |
| 17 | 131124 |
| 18 | 262199 |
| 19 | 524346 |
| 20 | 1048637 |
| 21 | 2097216 |
| 22 | 4194371 |
| 23 | 8388678 |
| 24 | 16777289 |
| 25 | 33554508 |
| 26 | 67108943 |
| 27 | 134217810 |
| 28 | 268435541 |
| 29 | 536871000 |
| 30 | 1073741915 |
| 31 | 2147483742 |