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 | 0 |
| 2 | 2 |
| 3 | 3 |
| 4 | 0 |
| 5 | -1 |
| 6 | 0 |
| 7 | 9 |
| 8 | 3 |
| 9 | -18 |
| 10 | -27 |
| 11 | 38 |
| 12 | 63 |
| 13 | 3 |
| 14 | -132 |
| 15 | -54 |
| 16 | 200 |
| 17 | 395 |
| 18 | -258 |
| 19 | -666 |
| 20 | 336 |
| 21 | 2111 |
| 22 | 836 |
| 23 | -3454 |
| 24 | -4020 |
| 25 | 9290 |
| 26 | 14408 |
| 27 | 1215 |
| 28 | -43886 |
| 29 | -13043 |
| 30 | 92456 |
| 31 | 155854 |
| 32 | -162756 |
| 33 | -396316 |
| 34 | 43971 |
| 35 | 1201705 |
| 36 | 442641 |
| 37 | -1922050 |
| 38 | -3359287 |
| 39 | 3887946 |
| 40 | 9202219 |
| 41 | 529036 |
| 42 | -24727323 |
| 43 | -11980753 |
| 44 | 48090463 |