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 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 4 |
| 6 | 0 |
| 7 | -13 |
| 8 | -40 |
| 9 | -81 |
| 10 | -122 |
| 11 | -122 |
| 12 | 0 |
| 13 | 365 |
| 14 | 1094 |
| 15 | 2187 |
| 16 | 3280 |
| 17 | 3280 |
| 18 | 0 |
| 19 | -9841 |
| 20 | -29524 |
| 21 | -59049 |
| 22 | -88574 |
| 23 | -88574 |
| 24 | 0 |
| 25 | 265721 |
| 26 | 797162 |
| 27 | 1594323 |
| 28 | 2391484 |
| 29 | 2391484 |
| 30 | 0 |
| 31 | -7174453 |
| 32 | -21523360 |
| 33 | -43046721 |
| 34 | -64570082 |
| 35 | -64570082 |
| 36 | 0 |