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 | -7 |
| 3 | -20 |
| 4 | -8 |
| 5 | 99 |
| 6 | 455 |
| 7 | 958 |
| 8 | 715 |
| 9 | -3606 |
| 10 | -17450 |
| 11 | -44157 |
| 12 | -61852 |
| 13 | 19546 |
| 14 | 419786 |
| 15 | 1442212 |
| 16 | 3084950 |
| 17 | 3756436 |
| 18 | -2155907 |
| 19 | -27112107 |
| 20 | -88277693 |
| 21 | -187777531 |
| 22 | -251308697 |
| 23 | -5153980 |
| 24 | 1182558343 |
| 25 | 4299818445 |
| 26 | 9988792754 |
| 27 | 16075200671 |
| 28 | 12020651310 |
| 29 | -29802956283 |