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 | -2 |
| 4 | -4 |
| 5 | 1 |
| 6 | -14 |
| 7 | 0 |
| 8 | -7 |
| 9 | 1 |
| 10 | -143 |
| 11 | -22 |
| 12 | 11 |
| 13 | -11 |
| 14 | 1 |
| 15 | -1928 |
| 16 | -260 |
| 17 | -40 |
| 18 | 40 |
| 19 | -16 |
| 20 | 1 |
| 21 | -32219 |
| 22 | -3894 |
| 23 | -385 |
| 24 | -121 |
| 25 | 99 |
| 26 | -22 |
| 27 | 1 |
| 28 | -640784 |
| 29 | -70644 |
| 30 | -6496 |
| 31 | -406 |
| 32 | -406 |
| 33 | 203 |
| 34 | -29 |
| 35 | 1 |
| 36 | -14753528 |
| 37 | -1502940 |
| 38 | -128723 |
| 39 | -9583 |
| 40 | 259 |
| 41 | -1184 |
| 42 | 370 |
| 43 | -37 |
| 44 | 1 |
| 45 | -385500056 |
| 46 | -36631962 |
| 47 | -2947266 |
| 48 | -205620 |
| 49 | -14076 |
| 50 | 3657 |
| 51 | -2967 |
| 52 | 621 |