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) |
|---|---|
| 4 | 2 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 1 |
| 9 | 0 |
| 10 | 0 |
| 11 | 1 |
| 12 | 37 |
| 13 | -60 |
| 14 | -5 |
| 15 | 37 |
| 16 | 174 |
| 17 | -955 |
| 18 | -10545 |
| 19 | 38610 |
| 20 | 176297 |
| 21 | -322740 |
| 22 | -205420 |
| 23 | 4512655 |
| 24 | 56820585 |
| 25 | -104019264 |
| 26 | -25907081 |
| 27 | 94854194 |
| 28 | 1141847218 |
| 29 | -2090335775 |
| 30 | -414239903275 |
| 31 | 6066664425833 |
| 32 | 85621405759989 |
| 33 | -156743813184120 |
| 34 | -4337631088920 |
| 35 | 47644406040193 |
| 36 | 1265208493396175131 |
| 37 | -2316168508680582540 |
| 38 | -192288633159406495 |