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 | -5 |
| 3 | -29 |
| 4 | -71 |
| 5 | -23 |
| 6 | 547 |
| 7 | 2395 |
| 8 | 4657 |
| 9 | -2927 |
| 10 | -53621 |
| 11 | -188141 |
| 12 | -269975 |
| 13 | 613369 |
| 14 | 4883251 |
| 15 | 14012683 |
| 16 | 12101473 |
| 17 | -77708255 |
| 18 | -419746277 |
| 19 | -979610813 |
| 20 | -140726759 |
| 21 | 8253590281 |
| 22 | 34280901955 |
| 23 | 62841295291 |
| 24 | -57162936431 |
| 25 | -794223403343 |
| 26 | -2662427185493 |
| 27 | -3501698111885 |