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 | -17 |
| 2 | 119 |
| 3 | -442 |
| 4 | 1054 |
| 5 | -2805 |
| 6 | 10336 |
| 7 | -29393 |
| 8 | 60724 |
| 9 | -150620 |
| 10 | 452914 |
| 11 | -1066546 |
| 12 | 2195703 |
| 13 | -5396208 |
| 14 | 13442002 |
| 15 | -29151005 |
| 16 | 62519523 |
| 17 | -141740051 |
| 18 | 317832119 |
| 19 | -683311906 |
| 20 | 1431370114 |
| 21 | -3054813215 |
| 22 | 6608329573 |
| 23 | -13743348845 |