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 | 1 |
| 3 | 2 |
| 4 | 0 |
| 5 | 4 |
| 6 | -11 |
| 7 | 6 |
| 8 | -24 |
| 9 | -18 |
| 10 | -79 |
| 11 | 10 |
| 12 | -276 |
| 13 | 12 |
| 14 | -447 |
| 15 | -464 |
| 16 | -1008 |
| 17 | 16 |
| 18 | -3636 |
| 19 | 18 |
| 20 | -5580 |
| 21 | -5228 |
| 22 | -11263 |
| 23 | 22 |
| 24 | -41184 |
| 25 | -3100 |
| 26 | -53247 |
| 27 | -59022 |
| 28 | -116004 |
| 29 | 28 |
| 30 | -454501 |
| 31 | 30 |
| 32 | -524256 |
| 33 | -649868 |
| 34 | -1114111 |
| 35 | -121344 |
| 36 | -4438368 |
| 37 | 36 |
| 38 | -4980735 |
| 39 | -6909200 |
| 40 | -11106720 |
| 41 | 40 |
| 42 | -44114197 |
| 43 | 42 |