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 | 1 |
| 3 | 1 |
| 4 | 0 |
| 5 | -2 |
| 6 | -5 |
| 7 | -4 |
| 8 | 9 |
| 9 | 39 |
| 10 | 46 |
| 11 | -101 |
| 12 | -516 |
| 13 | -624 |
| 14 | 2021 |
| 15 | 9704 |
| 16 | 8847 |
| 17 | -58363 |
| 18 | -230932 |
| 19 | -65902 |
| 20 | 2085381 |
| 21 | 6301393 |
| 22 | -5195375 |
| 23 | -84748630 |
| 24 | -174659303 |
| 25 | 535875052 |
| 26 | 3703162955 |
| 27 | 3578704451 |
| 28 | -39485091237 |
| 29 | -163826467050 |
| 30 | 88095454403 |
| 31 | 2675998434838 |
| 32 | 6571312338031 |