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 | 1 |
| 3 | -2 |
| 4 | 4 |
| 5 | -8 |
| 6 | 7 |
| 7 | 22 |
| 8 | -125 |
| 9 | 376 |
| 10 | -878 |
| 11 | 1756 |
| 12 | -3143 |
| 13 | 5188 |
| 14 | -8189 |
| 15 | 13102 |
| 16 | -22928 |
| 17 | 45856 |
| 18 | -101549 |
| 19 | 232618 |
| 20 | -524285 |
| 21 | 1137148 |
| 22 | -2362874 |
| 23 | 4725748 |
| 24 | -9185771 |
| 25 | 17574376 |
| 26 | -33554429 |
| 27 | 64717378 |
| 28 | -127043276 |
| 29 | 254086552 |
| 30 | -515347553 |
| 31 | 1052218462 |
| 32 | -2147483645 |