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) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 288 |
| 4 | -1736 |
| 5 | 4890 |
| 6 | 0 |
| 7 | -16660 |
| 8 | 44576 |
| 9 | -103869 |
| 10 | 0 |
| 11 | 534744 |
| 12 | -499968 |
| 13 | -577582 |
| 14 | 0 |
| 15 | 1408320 |
| 16 | 2507344 |
| 17 | -6905730 |
| 18 | 0 |
| 19 | 10661648 |
| 20 | -8489040 |
| 21 | -4798080 |
| 22 | 0 |
| 23 | 18643548 |
| 24 | 12837888 |
| 25 | -25207475 |
| 26 | 0 |
| 27 | -77183496 |
| 28 | 28921760 |
| 29 | 128406978 |
| 30 | 0 |
| 31 | -52842796 |
| 32 | -151328128 |
| 33 | 154006272 |
| 34 | 0 |
| 35 | -81467400 |