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 | -3 |
| 2 | 6 |
| 3 | -10 |
| 4 | 14 |
| 5 | -16 |
| 6 | 12 |
| 7 | 4 |
| 8 | -40 |
| 9 | 104 |
| 10 | -200 |
| 11 | 320 |
| 12 | -432 |
| 13 | 464 |
| 14 | -288 |
| 15 | -288 |
| 16 | 1504 |
| 17 | -3584 |
| 18 | 6592 |
| 19 | -10176 |
| 20 | 13184 |
| 21 | -13184 |
| 22 | 6016 |
| 23 | 14336 |
| 24 | -55040 |
| 25 | 122112 |
| 26 | -215552 |
| 27 | 321024 |
| 28 | -397824 |
| 29 | 364544 |
| 30 | -87040 |
| 31 | -621568 |
| 32 | 1972224 |
| 33 | -4118528 |
| 34 | 6993920 |
| 35 | -10043392 |
| 36 | 11849728 |
| 37 | -9711616 |
| 38 | -663552 |
| 39 | 25026560 |