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 | 1 |
| 2 | 1 |
| 3 | -1 |
| 4 | -3 |
| 5 | -2 |
| 6 | 4 |
| 7 | 9 |
| 8 | 3 |
| 9 | -15 |
| 10 | -25 |
| 11 | 0 |
| 12 | 52 |
| 13 | 65 |
| 14 | -27 |
| 15 | -169 |
| 16 | -155 |
| 17 | 158 |
| 18 | 520 |
| 19 | 321 |
| 20 | -681 |
| 21 | -1519 |
| 22 | -481 |
| 23 | 2560 |
| 24 | 4200 |
| 25 | -79 |
| 26 | -8839 |
| 27 | -10881 |
| 28 | 4797 |
| 29 | 28638 |
| 30 | 25804 |
| 31 | -27351 |
| 32 | -87877 |
| 33 | -52895 |
| 34 | 116775 |
| 35 | 256000 |
| 36 | 76892 |
| 37 | -436655 |
| 38 | -705667 |
| 39 | 26871 |
| 40 | 1502085 |
| 41 | 1821118 |
| 42 | -850160 |