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 | 0 |
| 3 | -2 |
| 4 | -2 |
| 5 | 4 |
| 6 | 11 |
| 7 | -3 |
| 8 | -46 |
| 9 | -38 |
| 10 | 152 |
| 11 | 334 |
| 12 | -301 |
| 13 | -1855 |
| 14 | -719 |
| 15 | 7869 |
| 16 | 12450 |
| 17 | -23422 |
| 18 | -87520 |
| 19 | 12924 |
| 20 | 447028 |
| 21 | 458664 |
| 22 | -1699630 |
| 23 | -4308816 |
| 24 | 3528771 |
| 25 | 26104199 |
| 26 | 12852166 |
| 27 | -118868366 |
| 28 | -207528889 |
| 29 | 368534179 |
| 30 | 1517678456 |
| 31 | -109794866 |
| 32 | -8068372174 |
| 33 | -9080718086 |
| 34 | 31552958156 |
| 35 | 85735418464 |
| 36 | -63813069724 |
| 37 | -530936155928 |
| 38 | -300127192606 |