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 | 0 |
| 3 | -3 |
| 4 | -7 |
| 5 | -8 |
| 6 | 1 |
| 7 | 25 |
| 8 | 56 |
| 9 | 61 |
| 10 | -15 |
| 11 | -208 |
| 12 | -447 |
| 13 | -463 |
| 14 | 176 |
| 15 | 1725 |
| 16 | 3561 |
| 17 | 3496 |
| 18 | -1855 |
| 19 | -14263 |
| 20 | -28312 |
| 21 | -26243 |
| 22 | 18401 |
| 23 | 117600 |
| 24 | 224641 |
| 25 | 195681 |
| 26 | -175520 |
| 27 | -967043 |
| 28 | -1778727 |
| 29 | -1447848 |
| 30 | 1628801 |
| 31 | 7932025 |
| 32 | 14054296 |
| 33 | 10615741 |
| 34 | -14809135 |
| 35 | -64904048 |
| 36 | -110805567 |
| 37 | -76993903 |
| 38 | 132527376 |