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 | 2 |
| 2 | -2 |
| 3 | 6 |
| 4 | 6 |
| 5 | -10 |
| 6 | 70 |
| 7 | -42 |
| 8 | 102 |
| 9 | 374 |
| 10 | -506 |
| 11 | 2070 |
| 12 | -90 |
| 13 | 182 |
| 14 | 16198 |
| 15 | -16554 |
| 16 | 50406 |
| 17 | 46070 |
| 18 | -77690 |
| 19 | 573078 |
| 20 | -359898 |
| 21 | 884534 |
| 22 | 2980294 |
| 23 | -4090410 |
| 24 | 17127270 |
| 25 | -1465738 |
| 26 | 2996998 |
| 27 | 131089686 |
| 28 | -136821594 |
| 29 | 422976950 |
| 30 | 352097350 |
| 31 | -600716202 |
| 32 | 4688726502 |
| 33 | -3073380106 |
| 34 | 7645103494 |
| 35 | 23717948310 |
| 36 | -33014782170 |
| 37 | 141611506742 |