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 | 1 |
| 2 | -4 |
| 3 | 5 |
| 4 | 3 |
| 5 | -17 |
| 6 | 33 |
| 7 | -61 |
| 8 | 67 |
| 9 | 63 |
| 10 | -392 |
| 11 | 803 |
| 12 | -1070 |
| 13 | 898 |
| 14 | 482 |
| 15 | -4449 |
| 16 | 11362 |
| 17 | -18630 |
| 18 | 21105 |
| 19 | -11067 |
| 20 | -24871 |
| 21 | 103562 |
| 22 | -227004 |
| 23 | 359040 |
| 24 | -417697 |
| 25 | 266106 |
| 26 | 312987 |
| 27 | -1578543 |
| 28 | 3635615 |
| 29 | -6157911 |
| 30 | 8155892 |
| 31 | -7689028 |
| 32 | 1502546 |
| 33 | 14707881 |
| 34 | -44539735 |
| 35 | 87849728 |
| 36 | -136927058 |
| 37 | 171008704 |