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 | 1 |
| 2 | -4 |
| 3 | -19 |
| 4 | -48 |
| 5 | -93 |
| 6 | -152 |
| 7 | -215 |
| 8 | -256 |
| 9 | -217 |
| 10 | 24 |
| 11 | 717 |
| 12 | 2368 |
| 13 | 5995 |
| 14 | 13640 |
| 15 | 29393 |
| 16 | 61440 |
| 17 | 126159 |
| 18 | 256312 |
| 19 | 517429 |
| 20 | 1040576 |
| 21 | 2087891 |
| 22 | 4183656 |
| 23 | 8376441 |
| 24 | 16763392 |
| 25 | 33538807 |
| 26 | 67091288 |
| 27 | 134198045 |
| 28 | 268413504 |
| 29 | 536846523 |
| 30 | 1073714824 |
| 31 | 2147453857 |
| 32 | 4294934528 |