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 | -2 |
| 2 | 1 |
| 3 | 6 |
| 4 | -5 |
| 5 | 1 |
| 6 | -30 |
| 7 | 31 |
| 8 | -10 |
| 9 | 1 |
| 10 | 210 |
| 11 | -247 |
| 12 | 101 |
| 13 | -17 |
| 14 | 1 |
| 15 | -2310 |
| 16 | 2927 |
| 17 | -1358 |
| 18 | 288 |
| 19 | -28 |
| 20 | 1 |
| 21 | 30030 |
| 22 | -40361 |
| 23 | 20581 |
| 24 | -5102 |
| 25 | 652 |
| 26 | -41 |
| 27 | 1 |
| 28 | -510510 |
| 29 | 716167 |
| 30 | -390238 |
| 31 | 107315 |
| 32 | -16186 |
| 33 | 1349 |
| 34 | -58 |
| 35 | 1 |
| 36 | 9699690 |
| 37 | -14117683 |
| 38 | 8130689 |
| 39 | -2429223 |
| 40 | 414849 |
| 41 | -41817 |
| 42 | 2451 |
| 43 | -77 |
| 44 | 1 |