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) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | -1 |
| 4 | -1 |
| 5 | 2 |
| 6 | 6 |
| 7 | -1 |
| 8 | -29 |
| 9 | -32 |
| 10 | 108 |
| 11 | 311 |
| 12 | -185 |
| 13 | -1991 |
| 14 | -1590 |
| 15 | 9468 |
| 16 | 22163 |
| 17 | -26645 |
| 18 | -170511 |
| 19 | -70359 |
| 20 | 955734 |
| 21 | 1755790 |
| 22 | -3561052 |
| 23 | -16020532 |
| 24 | 309754 |
| 25 | 102695477 |
| 26 | 141637053 |
| 27 | -463468990 |
| 28 | -1567907433 |
| 29 | 806541136 |
| 30 | 11367276801 |
| 31 | 10768399120 |
| 32 | -59447130815 |
| 33 | -155142592628 |
| 34 | 172852194214 |
| 35 | 1273466836673 |