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) |
|---|---|
| 3 | 1 |
| 4 | 10 |
| 5 | 0 |
| 6 | 0 |
| 7 | -88 |
| 8 | -132 |
| 9 | 0 |
| 10 | 0 |
| 11 | 1275 |
| 12 | 736 |
| 13 | 0 |
| 14 | 0 |
| 15 | -8040 |
| 16 | -2880 |
| 17 | 0 |
| 18 | 0 |
| 19 | 24035 |
| 20 | 13080 |
| 21 | 0 |
| 22 | 0 |
| 23 | -14136 |
| 24 | -54120 |
| 25 | 0 |
| 26 | 0 |
| 27 | -128844 |
| 28 | 115456 |
| 29 | 0 |
| 30 | 0 |
| 31 | 389520 |
| 32 | 38016 |
| 33 | 0 |
| 34 | 0 |
| 35 | -256410 |
| 36 | -697950 |
| 37 | 0 |
| 38 | 0 |
| 39 | -806520 |
| 40 | 963160 |
| 41 | 0 |
| 42 | 0 |
| 43 | 1892363 |
| 44 | 938400 |
| 45 | 0 |
| 46 | 0 |
| 47 | -1227600 |
| 48 | -2309120 |
| 49 | 0 |
| 50 | 0 |
| 51 | -813450 |
| 52 | -2813096 |
| 53 | 0 |
| 54 | 0 |